Prediction of residual feed intake for first-lactation dairy cows using orthogonal polynomial random regression
نویسندگان
چکیده
منابع مشابه
Relationships between body condition score change, prior mid-lactation phenotypic residual feed intake, and hyperketonemia onset in transition dairy cows.
Extensive efforts have been made to identify more feed-efficient dairy cows, yet it is unclear how selection for feed efficiency will influence metabolic health. The objectives of this research were to determine the relationships between residual feed intake (RFI), a measure of feed efficiency, body condition score (BCS) change, and hyperketonemia (HYK) incidence. Blood and milk samples were co...
متن کاملA Random Regression Analysis of Sow Lactation Feed Intake and the Effect of Temperature on Intake
Lactation feed intake (LFI) has only recently been considered as a possible selection criterion to assist in tackling the issue of sow longevity. It has been postulated that adequate LFI is needed to maintain sow body condition and development and to provide for suckling offspring. Hermesch and Jones (2007) showed that, on average, primiparous sows eating <3.5kg/day during lactation were signif...
متن کاملRelationships between feeding behaviour and feed intake in dairy cows during early lactation
VII CHAPTER 1: Introduction 1 CHAPTER 2: Background 3 2.1 Feed intake in transition period 5 2.2 Regulation of feed intake 7 2.3 Feeding behaviour 14 2.4 Measuring of feeding behaviour 16 2.5 Physiological changes and metabolic disorders during transition period and early lactation 22 2.6 Sensor-based monitoring of feeding behaviour and feed intake as well as metabolic-related production diseas...
متن کاملEnergy balance profiles for the first three lactations of dairy cows estimated using random regression.
Daily animal solutions were predicted using random regression analysis for feed intake, milk yield, live weight, and condition score recorded on 189 cows at the Langhill Dairy Cattle Research Centre. All cows had three successive lactations. Energy balance for days 1 to 305 of each of the three lactations was calculated both from daily measures of feed intake and milk output and from weekly mea...
متن کاملLongitudinal analysis of residual feed intake and BW in mink using random regression with heterogeneous residual variance.
The aim of this study was to determine the genetic background of longitudinal residual feed intake (RFI) and BW gain in farmed mink using random regression methods considering heterogeneous residual variances. The individual BW was measured every 3 weeks from 63 to 210 days of age for 2139 male+female pairs of juvenile mink during the growing-furring period. Cumulative feed intake was calculate...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 2013
ISSN: 0022-0302
DOI: 10.3168/jds.2013-6560