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Effects of feed intake and genetics on tissue nitrogen-15 enrichment and feed conversion efficiency in sheep
(Oxford University Press on behalf of the American Society of Animal Science, 2015-12-01)
This study investigated the effects of sheep genetics and feed intake on nitrogen isotopic fractionation (Δ15N) and feed conversion efficiency (FCE; live weight gain/DMI), using a 2 × 2 factorial design, with 2 levels of ...
Body weight of dairy heifers is positively associated with reproduction and stayability
(American Dairy Science Association, 2020-02-26)
This study investigated the relationships between body weight (BW) and stayability, and BW and calving pattern, of 189,936 New Zealand dairy heifers. Heifers were classified into 5 breed groups: Holstein-Friesian (F), ...
Effects of FABP4 variation on milk fatty-acid composition for dairy cattle grazed on pasture in late lactation
(Cambridge University Press on behalf of the Hannah Dairy Research Foundation, 2020-01-31)
This research communication describes associations between variation in the fatty acid binding protein 4 gene (FABP4) and milk fat composition in New Zealand Holstein-Friesian × Jersey cross dairy cows. After correcting ...
Positive relationships between body weight of dairy heifers and their first-lactation and accumulated three-parity lactation production
(Elsevier on behalf of the American Dairy Science Association and the Federation of Animal Science Societies, 2019-03-01)
This study investigated the relationships between body weight (BW) and milk production of 140,113 New Zealand dairy heifers. Heifers were classified into 5 breed groups: Holstein-Friesian, Holstein-Friesian crossbred, ...
The effects of dietary nitrogen to water-soluble carbohydrate ratio on isotopic fractionation and partitioning of nitrogen in non-lactating sheep
(Cambridge University Press (CUP) on behalf of the Animal Consortium, 2013-08)
The main objective of this study was to investigate the relationship between partitioning and isotopic fractionation of nitrogen (N) in sheep consuming diets with varying ratios of N to water-soluble carbohydrate (WSC). ...
Variation in the toll-like receptor 4 (TLR4) gene affects milk traits in dairy cows
(Cambridge University Press on behalf of the Institute of Food Research and the Hannah Research Institute, 2017-11)
The objective of this Research Communication was to use polymerase chain reaction-single stranded conformational polymorphism (PCR-SSCP) analysis to investigate a region of the bovine TLR4 gene (TLR4) in pasture-fed New ...
Technical note: Nitrogen isotopic fractionation can be used to predict nitrogen-use efficiency in dairy cows fed temperate pasture
(Oxford University Press on behalf of the American Society of Animal Science, 2013-12)
The objective of this study was to investigate the relationship between nitrogen isotopic fractionation (δ¹⁵N) and nitrogen-use efficiency (milk nitrogen/nitrogen intake; NUE) in pasture-fed dairy cows supplemented with ...
Nitrogen partitioning and milk production of dairy cows grazing simple and diverse pastures
(Elsevier on behalf of the American Dairy Science Association, 2013-01)
Research was conducted to examine the effects of a diverse pasture mix on dry matter intake, milk yield, and N partitioning of lactating dairy cows. A pasture containing only ryegrass and white clover (RG), or high ...
Haplotypic variation in the UCP1 gene is associated with milk traits in dairy cows
(American Dairy Science Association, 2016-10-03)
Uncoupling protein-1 (UCP1) plays a role in the regulation of body temperature, metabolic rate and energy expenditure in animals. While variation in UCP1 and its phenotypic effect has been investigated in humans and sheep, ...
Supplementing grape marc to cows fed a pasture-based diet as a method to alter nitrogen partitioning and excretion
(Elsevier on behalf of the American Dairy Science Association, 2012-02)
The inclusion of the grape marc into livestock rations provides an opportunity not only to use a waste byproduct resourcefully, but also to induce beneficial metabolic changes in animals. Grape marc contains
condensed ...