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Eutrophication and climate change impacts of a case study of New Zealand beef to the European market
(Elsevier, 2020-03-25)
Objective: Beef production in the Lake Taupō region of New Zealand (NZ) is regulated for nitrogen (N) leaching. The objectives of this study were to 1) evaluate the implications of nitrogen emission limitations on ...
Detection of mastitis and its stage of progression by automatic milking systems using artificial neural networks
(Cambridge University Press, 2010-05)
Two types of artificial neural networks, multilayer perceptron (MLP) and self-organizing feature map (SOM) were used to detect mastitis by automatic milking systems (AMS) using a new mastitis indicator that combined two ...
The performance of an efficient dairy system using a combination of nitrogen leaching mitigation strategies in a variable climate
(Elsevier, 2017-12-01)
An efficient dairy system, that implemented a combination of nitrogen (N) leaching mitigation strategies including lower N fertilizer input, standing cows off pasture for part of the day in autumn and winter (stand-off), ...
Dairy farm effluent effects on urine patch nitrous oxide and carbon dioxide emissions
(American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, 2005)
Dairy farm effluent (DFE) comprises animal feces, urine, and wash-down water collected at the milking shed. This is collected daily during the milking season and sprayed onto grazed dairy pastures. Urine patches in grazed ...
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 ...
Increased yearling weight as a proportion of 21-month weight was associated with increased milk production in dairy heifers
(Taylor & Francis on behalf of New Zealand Veterinary Association, 2020-05-25)
Aims: To examine the relationship between liveweight (LWT) at 12 months as a proportion of LWT at 21 months of age (LWT(12/21)%) and first lactation and cumulative 3-year milk production in dairy heifers in New Zealand.
Methods: ...
How does stage of lactation and breeding worth affect milk solids production and production efficiency of grazing dairy cows?
(Taylor & Francis, 2019-03-18)
The study investigated the effect of stage of lactation and Breeding Worth (BW) index on estimated dry matter intake (DMI), milk solids (MS) production, energy use efficiency (EUE) and feed conversion efficiency (FCE) of ...
Short communication: Estimation of the financial benefit of using Jersey milk at different inclusion rates for Cheddar cheese production using partial budgeting
(Elsevier on behalf of American Dairy Science Association, 2015-03)
Partial budgeting was used to estimate the net benefit of blending Jersey milk in Holstein-Friesian milk for Cheddar cheese production. Jersey milk increases Cheddar cheese yield. However, the cost of Jersey milk is also ...
Production intensification and animal health expenditure on dairy farms in New Zealand
(American Dairy Science Association, 2020-02)
Although previous studies have investigated the ef-fects of production intensification on farm economic performance and production efficiency in the dairy sector, knowledge is currently lacking on how ...