Web Access Research Portal

Researcher: Roche, JR (Dr John Roche)

Fields of Research

Animal nutrition
Animal production
Agronomy
Animal management
Crop and pasture production
Animal reproduction and breeding
Crop and pasture biochemistry and physiology
Crop and pasture nutrition
Animal growth and development
Sustainable agricultural development

Research Objectives

Dairy cattle
Sown pastures (excl. lucerne)
Sheep for meat
Oats
Other animal production and animal primary products
Pasture, browse and fodder crops

Career Best Publications

A low Dietary Cation-Anion Difference precalving and calcium supplementation post-calving increase plasma calcium but not milk production in a pasture-based system; Journal of Dairy Science
Dietary Cation-Anion Difference and the health and production of grass-fed cows. 1. Dairy cows in early lactation; Journal of Dairy Science
Dietary Cation-Anion Difference and the health and production of pasture-fed dairy cows. 2. Non-lactating periparturient cows; Journal of Dairy Science
Influence of precalving feed allowance on periparturient metabolic and hormonal responses and milk production in grazing dairy cows; Journal of Dairy Science
Relationships among international body condition scoring systems; Journal of Dairy Science
Sulfur and chlorine play a non-acid base role in periparturient calcium homeostasis; Journal of Dairy Science

Research Publications

A comparative study of ovarian follicular dynamics and IGF-1 concentrations during an oestrus cycle in two genotypes of lactating Holstein-Friesian cows, offered pasture or a total mixed ration; 15th Association for the Advancement of Animal Breeding and Genetics Conference
A comparison between feeding systems (pasture and TMR) and the effect of vitamin E supplementation on plasma and milk fatty acid profiles in dairy cows; Journal of Dairy Research
A comparison of the changes in herbage quality of cocksfoot (Dactylis glomerata L.), prairie grass (Bromus willdenowii Kunth.) and tall fescue (Festuca arundinacea Schreb.) during regrowth; Dairy Research Foundation (DRF) Annual Symposium
A low Dietary Cation-Anion Difference precalving and calcium supplementation post-calving increase plasma calcium but not milk production in a pasture-based system; Journal of Dairy Science
A novel minimal model to describe non-esterified fatty acid kinetics in Holstein dairy cows; Journal of Dairy Research
A nutrient-signaling effect of grain feeding on postpartum anovulatory intervals in mature dairy cows; Conference of the New Zealand Society of Animal Production
A review of the energy and protein nutrition of dairy cows through their dry period and its impact on early lactation performance
Achieving high performance from a range of farm systems
Agriculture in Australia
Altering structural to non-structural carbohydrate ratio in the diet of transition dairy cows grazing pasture did not affect subsequent health or production; Journal of Dairy Science
Altering systemic acid-base balance through nutrition failed to change secondary sex ratio; Reproduction, Fertility and Development
Association between Body Condition Score and Liveweight in Pasture-based Holstein-Friesian Dairy Cows; Journal of Dairy Research
Associations Among Body Condition Score, Body Weight, Somatic Cell Count, and Clinical Mastitis in Seasonally Calving Dairy Cattle; Journal of Dairy Science
Associations between Body Condition Score, Bodyweight and Reproductive Performance in Seasonal-calving Pasture-based Dairy Cattle; Journal of Dairy Science
Australian Research relevant here
Autumn Grazing Management
Biotechnology And Dairy Farming; South African Large Herds Conference
Black and white answers on the modern dairy cow
Body condition score 5: an old wives' tale or the foundation for profit
Body Condition Score and Body Weight Effects on Dystocia and Stillbirths and Consequent Effects on Postcalving Performance; Journal of Dairy Science
Caution on Anionic Salts
Changes in herbage quality of cocksfoot, prairie grass and tall fescue during regrowth; XXI International Grasslands Congress
Changes in plasma ghrelin in response to a glucose challenge are associated with changes in plasma fatty acid and insulin, but not glucose; Ruminant Reproduction Symposium
Climatic factors and secondary sex ratio in dairy cows - support for the Trivers-Willard hypothesis in dairy cows; Journal of Dairy Science
Concentrate Supplementation Reduces Postprandial Plasma Ghrelin in Grazing Dairy Cows: A Possible Neuro-endocrine Basis for Reduced Pasture Intake in Supplemented Cows; Journal of Dairy Science
Condition score is important. Messages to remember
Condition Scoring Made Easy; Dexcel Limited
Dairy and Sheep in the same Farming enterprise
Dairying Down Under
Describing the Body Condition Score Change Between Successive Calvings: A Novel Strategy Generalizable to Diverse Cohorts; Journal of Dairy Science
Diet and genotype affect feeding behaviour in Holstein-Friesian dairy cows; NZSAP Annual Conference
Diet and genotype affect plasma calcium, magnesium and phosphorus concentrations in the periparturient cow; Conference of the New Zealand Society of Animal Production
Diet and genotype effects on bovine milk lactoferrin; NZSAP Annual Conference
Diet or strain: effects on postpartum anoestrous interval in dairy cows; Conference of the New Zealand Society of Animal Production
Dietary Cation Anion Balance
Dietary Cation Anion Balance
Dietary Cation-Anion Difference and the health and production of grass-fed cows. 1. Dairy cows in early lactation; Journal of Dairy Science
Dietary Cation-Anion Difference and the health and production of pasture-fed dairy cows. 2. Non-lactating periparturient cows; Journal of Dairy Science
Dietary Cation-Anion Difference for pasture-fed dairy cows, PhD Dissertation, National University of Ireland
Digestion of pasture in response to fumarate in continuous culture; Journal of Dairy Science
Do higher grazing residuals in winter grow more grass
Do higher grazing residuals in winter grow more grass?
Dry Cow Feeding
Dry Cow Feeding
Dry matter intake of periparturient cows on a fresh pasture/pasture-hay diet
Dry matter intake, nutrient selection and milk production of dairy cows grazing rainfed perennial pastures at different herbage allowances in spring; Australian Journal of Experimental Agriculture
Effect of a metabolically created systemic acidosis on calcium homeostasis and the diurnal variation in urine pH in the non-lactating pregnant dairy cow; Journal of Dairy Research
Effect of Autumn Closing Date of Pasture and Turnout Date in Spring on the performance of Spring Calving Cows in Early-Lactation; 21st Annual Research Conference of the Irish Grassland and Animal Production Society
Effect of defoliation frequency and height during winter on herbage regrowth and water-soluble carbohydrate content of perennial ryegrass (Lolium perenne L.) dominant swards; XXI International Grasslands Congress
Effect of defoliation severity on regrowth and nutritive value of perennial ryegrass dominant swards; Agronomy Journal
Effect of dietary cation anion-difference on the milk production of early lactation dairy cows; Journal of Dairy Science
Effect of extended lactation on fertility of divergent Holstein-Friesian genotypes within a seasonal pasture-based dairy system; Journal of Dairy Science
Effect of Feeding Frequency on Pasture Intake and Milk Production of Grazing Cows; 21st Biennial Meeting of the Australian Society of Animal Production.
Effect of feeding level pre- and post-puberty and body weight at first calving on growth, milk production, and fertility in grazing dairy cows; Journal of Dairy Science
Effect of Ghrelin and Obestatin Infusion on Milk Production, BCS, and Energy Balance in Dairy Cows; Journal of Dairy Science
Effect of grain or buffer supplementation on milk solids yield and rumen fermentation patterns of cows grazing highly digestible herbage in Spring
Effect of pre- and postpartum pasture feeding intakes on postpartum anoestrus intervals in dairy cows; Conference of the New Zealand Society of Animal Production
Effect of precalving feeding level on the milk production of grazing dairy cows; Conference of the New Zealand Society of Animal Production
Effect of pregnancy on milk production and bodyweight from identical twin study; Journal of Dairy Science
Effect of seasonal variation on rumen eukaryotic community structure in New Zealand Dairy Cows using molecular microbiology analyses; 11th European Congress on Biotechnology
Effect of stocking rate on pasture production, milk production and reproduction of dairy cows in pasture-based systems; Journal of Dairy Science
Effect of surface application of benzylaminopurine before and during water deficit on herbage production and quality; Australian Journal of Experimental Agriculture
Effect of surface applied glycine betaine on herbage production and quality of perennial ryegrass-white clover pastures; Australian Journal of Experimental Agriculture
Effect of vitamin E supplementation in late lactation on milk production and milk fatty acid profile; Journal of Dairy Science
Effects of dietary CLA on production parameters in pasture-fed transition dairy cows; Journal of Dairy Science
Effects of dietary conjugated linoleic acid on production and metabolic parameters in transition dairy cows grazing fresh pasture; Journal of Dairy Research
Effects of feeding level for four weeks precalving on milk production is small and dependent on level of feeding in early lactation; 65th Conference of the New Zealand Society of Animal Production
Effects of genotype and diet on milksolids production, body condition, and reproduction of cows milked continuously for 600 days; Conference of the New Zealand Society of Animal Production
Effects of increased dietary crude protein by feeding N-fertilized turnips or lupins to dairy cows in mid-lactation; Australian Journal of Experimental Agriculture
Effects of pasture feeding during the periparturient period on postpartum anovulation in grazed dairy Cows; Journal of Dairy Science
Energy is feed key to milk production
Energy nutrition of the pasture-based transition cow - a review
Energy partitioning in the modern dairy cow
Energy requirement of close-up dairy cows grazing pasture; Journal of Dairy Science
Enhancing ruminal concentrations of conjugated linoleic acid and transvaccenic acid; Journal of Dairy Science
Evaluation of a compartmental model to describe non-esterified fatty acid kinetics in Holstein dairy cows; Journal of Dairy Research
Extending lactation in pastoral systems using divergent Holstein-Friesian genotypes and levels of nutrition; Journal of Dairy Science
Fact or Fiction. How do I know who's telling the truth?
Fact or Fiction. How do I know who's telling the truth?
Fact or fiction? How do I know who's telling the truth?; South African Large Herds Conference
Feed additives for Australian and New Zealand dairy farms
Feed additives for Australian dairy farms
Feeding the cow close to calving
Feeding the dry cow close to calving
Feeding the transition cow- The myths and the magic
Fodder Turnips on Gippsland Dairy Farms; 37th Annual Conference of the Grassland Society of Victoria
Forage alone pre-calving is sufficient for forage-fed cows post-calving; Journal of Dairy Science
Fumarate reduces methane production from pasture fermented in continuous culture; Conference of the New Zealand Society of Animal Production
Future farm systems - where to from here
Genetic and phenotypic factors influencing milk, protein and fat yields of dairy cows in Tasmania, Australia; Journal of Dairy Science
Genetic Merit: latest New Zealand Research
Genetic Selection for Milk Production Increases Plasma Ghrelin Concentration in Pasture-based Dairy Cows; Journal of Dairy Science
Genotype and feed effects on annual milk production and reproduction grazing dairy cows; Journal of Dairy Science
Genotype and feed effects on BW and BCS profiles for grazing dairy cows; Journal of Dairy Science
Genotype and feed effects on milk production profiles for grazing dairy cows; Journal of Dairy Science
Getting cows to peak and holding them
Glucose minimal modelling in lactating dairy cows; Journal of Dairy Science
Grass to milk - the New Zealand Experience
Grassland Management Strategies to Increase the Role of Grazed Grass as a Feed to Spring Calving Cows in the July to December period; 21st Annual Research Conference of the Irish Grassland and Animal Production Society
Grassland research: goals for the future; XXth International Grassland Congress
Grazing Opportunities in the North East USA
Grazing severity - how low do you go?
High input farming - the road to a better life. More money, more options
High profit cows, High profit farms
Higher risk of grass tetany (hypomagnesaemia) at higher stocking rates
Holstein-Friesian comparison
Holstein-Friesian strain and feed effects on milk production, bodyweight and body condition score profiles in grazing dairy cows; Journal of Dairy Science
Home advice from abroad
How much feed do cows need in transition
How much feed does my cow need in the month before calving
Hypocalcaemia and DCAD for the pasture-based transition cow - a review
Impact of defoliation severity on photosynthesis, carbon metabolism and transport gene expression in perennial ryegrass; Functional Plant Biology: An International Journal of Plant Function
Increasing milk fat cis-9, trans-11 Conjugated Linoleic Acid content in pasture-fed cows; Journal of Dairy Science
Influence of dairy cow genotype on milksolids, body condition and reproduction response to concentrate supplementation; Conference of the New Zealand Society of Animal Production
Influence of precalving feed allowance on periparturient metabolic and hormonal responses and milk production in grazing dairy cows; Journal of Dairy Science
Interaction between water-soluble carbohydrate reserves and defoliation severity on the regrowth of perennial ryegrass (Lolium perenne L.) - dominant swards; Grass and Forage Science
Invited Review: New perspectives on the roles of nutrition and metabolic priorities in the subfertility of high-producing dairy cows; Journal of Dairy Science
Is the Grass greenest in Ireland
Lincoln's grazing management borne out in research
Lipolytic response of New Zealand and Overseas Holstein-Friesian dairy cows challenged with epinephrine; Conference of the New Zealand Society of Animal Production
Magnesium for milk fever
Magnesium for Milk Fever. Are all Magnesium sources created equal
Magnesium requirements of the dairy cow
Magnesium requirements of the dairy cow
Maize Silage for Dairy Cows
Making money out of supplementary feeds
Making the most of low cost supplementary feeds
Making the most of supplementary feeds
Managing the transition cow
Managing the transition cow on pasture - a testing time
Manipulating Dietary Cation-Anion Difference to early lactating dairy cows grazing pasture via drenching; Journal of Dairy Science
Metabolic maturity at birth and neonate lamb survival and growth. I. The effects of maternal low dose dexamethasone treatment as two time points in late gestation; Joint Annual Meeting ADSA, CSAS, ASAS 2009
Metabolic maturity at birth and neonate lamb survival and growth. II. Association among maternal factors, litter type, lamb birth weight, plasma metabolic and endocrine factors, lamb survival and behavior; Joint Annual Meeting ADSA, CSAS, ASAS 2009
Metabolic maturity at birth and neonate lamb survival and growth. III. Association among pre-suckling plasma metabolic and endocrine factors and lamb growth to weaning; Joint Annual Meeting ADSA, CSAS, ASAS 2009
Metabolic maturity at birth and neonate lamb survival and growth: The effects of maternal low dose dexamethasone treatment╣; Journal of Animal Science
Metabolic maturity at birth and neonate lamb survival: Association among maternal factors, litter size, lamb birth weight, and plasma metabolic and endocrine factors on survival and behavior; Journal of Animal Science
Milk production responses to pre- and postcalving dry matter Intake in grazing dairy cows; Livestock Science
Milk Production, Body Condition Score and reproduction responses to supplementation in grazing dairy cows; South Island Dairy Event
Milk Production, Body Condition Score And Reproduction Responses To Supplementation In Grazing Dairy Cows; South African Large Herds Conference
Minerals in dry cow nutrition
Modelling the impact of changing the decision to graze from rotation length to ryegrass leaf-stage; New Zealand Grassland Association
Molecular analyses of ruminant prokaryote populations in New Zealand dairy cows; 11th European Congress on Biotechnology
More frequent allocation of herbage does not improve the milk production of dairy cows in early lactation; Australian Journal of Experimental Agriculture
Neuroendocrine and physiological regulation of intake with particular reference to domesticated ruminant animals ; Nutrition Research Reviews
Neuroendocrine controllers of intake in dairy cows; Australasian Dairy Science Symposium: Meeting the Challenges for Pasture-Based Dairying
Nitrate toxicity - advice may be wrong
Nitrogen and its effects on grass palatability
Nitrogen may reduce clover growth
Nitrogen use at higher rates
Non-acid-base factors are partly responsible for increaseNon-increased urinary calcium excretion when anionic salts are fed; Journal of Dairy Science
Nutrition and Milk Composition
Nutrition of the pasture-based transition cow
Nutritional 'wisdom' often inapt for pasture cows
Nutritional concerns of feeding maize silage ┐ what do you need to know?
Nutritional strategies for the prevention of hypocalcaemia at calving for cows in pasture-based systems
Oats for dairying
Optimising financial returns from grazing in temperate pastures; XXth International Grassland Congress
Optimising profit in different pasture-based systems
Pasture - an excellent feed for dairy cows
Pasture versus total mixed ration during the periparturient period
Pastures and Supplements in Dairy Production Systems; Pasture and Supplements for Grazing Animals
Peak, Persistency, Profitability
Perennial ryegrass - how its morphology and growth dynamics affect production; The Society of Dairy Cattle Veterinarians of the New Zealand Veterinary Association
Periparturient Climatic, Animal and Management Factors Influencing the Incidence of Milk Fever in Grazing Systems; Journal of Dairy Science
Plasma insulin, growth hormone, and IGF-1 concentrations of Holstein-Friesian cows of divergent genotype offered varying levels of concentrate in early lactation; Conference of the New Zealand Society of Animal Production
Potassium does not negatively affect blood calcium in periparturient cows fed pasture; 11th International Conference on Production Diseases in Farm Animals
Pre-conception energy balance and secondary sex ratio - support for the Trivers-Willard hypothesis in dairy cows; Journal of Dairy Science
Predictive characteristics of lactation models for pasture-based Holstein Friesian dairy cows; Australasian Dairy Science Symposium: Meeting the Challenges for Pasture-Based Dairying
Pregnancy and milk solids production
Production and physiological indicators to select cows suitable for extended lactations; New Zealand Society of Animal Production
Production and physiological indicators to select pasture-based dairy cows suitable for extended lactations; Journal of Dairy Science
Profitable use of supplementary feeds
Protein - a supplement this summer?
Quality grass silage for protein
Quality or Quantity; ME or DM - Does it matter?
Reflections on an Irish Visit
Regulating milk fat synthesis: potential on-farm applications of basic science; Conference of the New Zealand Society of Animal Production
Relationships Among Body Condition Score, Body Weight and Milk Production Variables in Pasture-Based Dairy Cows; Journal of Dairy Science
Relationships among international body condition scoring systems; Journal of Dairy Science
Relationships between international body condition scoring systems; Journal of Dairy Science
Report on Travel to the Annual Conference of the Federation of Animal Science Societies in San Antonia, Texas, 8-10 July 2007
Short communication: Dry matter intake precalving in cows offered fresh and conserved pasture; Journal of Dairy Research
Short Communication: Effect of Postgrazing Residual Pasture Height on Milk Production; Journal of Dairy Science
Source of Magnesium important in preventing milk fever
Spring Grazing Management - Some lessons from a recent study carried out at Moorepark
Strain of Holstein-Friesian and concentrate feeding level influence endogenous plasma ghrelin concentration; Journal of Dairy Science
Sulfur and chlorine play a non-acid base role in periparturient calcium homeostasis; Journal of Dairy Science
Supplement feeds alter body condition score
Supplementation with concentrates either pre- or post-partum does not affect milk production when diets are isoenergetic; Conference of the New Zealand Society of Animal Production
The drinking behaviour of dairy cows in late lactation; 65th Conference of the New Zealand Society of Animal Production
The Effect of Closing Date in Autumn and start of grazing in Spring on the performance of Spring-Calving Dairy Cows in early lactation; 37th Annual Conference of the Grassland Society of Victoria
The Effect of Closing Date in Autumn and Turnout Date in Spring on the Performance of Spring-Calving Cows in Early Lactation, Masters Thesis, National University of Ireland
The Effect of Closing Date of Pasture in Autumn and Turnout Date in Spring on Sward Characteristics, Dry Matter Yield and Milk Production of Spring-Calving Dairy Cows; Irish Journal of Agricultural and Food Research
The Effect of Grazing Intensity in Late Summer/Autumn on Sward Characteristics and Milk Production of Spring-Calving Dairy Cows; Irish Journal of Agricultural and Food Research
The effect of precalving DMI on milk production is dependent on DMI in early lactation in grazing dairy systems; Journal of Dairy Science
The importance of cow condition
The incidence and control of hypocalcaemia in pasture-based systems; Acta Veterinaria Scandinavica
The kiwi cow - a misunderstood animal
The paradigm of efficiency and sustainability in the modern dairy cow; South African Society of Animal Science
The paradigm of efficiency and sustainability-a dairying perspective; South African Journal of Animal Science
TMR diets pre-calving reduced plasma calcium at calving and did not increase milk production; Journal of Dairy Science
Tool to guide condition scoring
Total mixed ration versus pasture diets: Evidence of a genotype x diet interaction
Transcriptome analysis reveals season-specific rbcS gene expression profiles in diploid perennial ryegrass (Lolium perenne L.); Plant Biotechnology Journal
Transition Cow Feeding
Transition Cow Nutrition
Transition Cow Nutrition
Transition Cow Nutrition. The myths and the magic
Transition Cow Nutrition: Priming your herd to perform
Transitional Feeding
Turnips and Protein Supplements for Lactating Dairy Cows; Australian Journal of Experimental Agriculture
Understanding body condition score and the effect it has on milk production, fertility and welfare
Understanding digestion and nutrition in the grazing dairy cow
Urine calcium but not plasma calcium or urine hydroxyproline is increased by systemic acidosis in the dairy cow
Using lactation curves as a tool for breeding, nutrition and health management decisions in pasture-based dairy systems; Dairy Research Foundation (DRF) Annual Symposium
Utilise the 20% rule
Variations in the Dietary Cation-Anion Difference and the acid-base balance of dairy cows on a pasture-based diet in south-eastern Australia; Grass and Forage Science
Weather, herbage quality and milk production in pastoral systems. 2. Temporal patterns and intra-relationships in herbage quality and mineral concentration parameters; Animal Production Science
Weather, herbage quality and milk production in pastoral systems. 4. Effects on dairy cattle production; Animal Production Science
Weather, herbage quality, and milk production in pastoral systems. 1. Temporal patterns and intra-relationships in weather variables; Animal Production Science
Weather, herbage quality, and milk production in pastoral systems. 3. Inter-relationships and associations between weather variables and herbage growth rate, quality and mineral concentration; Animal Production Science
What should I feed my dry cow precalving?
What to do with the transition cow

Research Projects

A review of differential feeding of concentrate supplements to pasture based Dairy cows; Dairy Australia Limited (DAL)
Attendance at the Annual Conference of the Federation of Animal Science Societies in San Antonio, Texas - July 8-12, 2007; Dairy Australia Limited (DAL)
Determining the Effect of a Reduced Dietary Cation-Anion Difference (DCAD) on the Outcome of the Incidence of Milk Fever in a Milk Fever-Prone Dairy Herd; DairyTas (DAIRYTAS)
Ruminant Nutrition and Farm Systems Research Fellow; Dairy Australia Limited (DAL)
The Integration of Lucerne into the Feedbase Systems of the Australian Dairy Industry; and Defining the Response to Concentrates for Cows Varying in Milk Production; Dairy Australia Limited (DAL)

Research Candidate Supervision

Integrating Financial and Environmental Data to Improve Farm Business Performance- An Exploratory Analysis of the Tasmanian Beef Industry
Modelling Lactation in Pasture-Based Dairy Cows Varying in Production Potential
Morphological, Physiological, and Molecular Responses in Perennial Ryegrass (Lolium perenne L.) Subjected to Varying Levels of Defoliation Severity
Quantifying Lucerne (Medicago sativa L.) Genotype by Environment Interactions in the Cool Temperate Dairy Regions of Australia