Lactation Curves
نویسندگان
چکیده
منابع مشابه
Lactation curves of commercial ewes rearing lambs.
Three-hour milk production measurements determined by machine milking at 3-d intervals throughout a 63-d lactation period were used to describe lactation curves for crossbred ewes lambing at 1 and 2 yr of age and rearing single and twin lambs. Age of ewe, type of rearing, and day of lactation affected (P < 0.05) milk production. Over the 63-d lactation, average daily milk production was 2.56 an...
متن کاملDecision-tree induction to interpret lactation curves
Pietersma, D., Lacroix, R., Lefebvre, D. and Wade, K.M. 2002. Decision-tree induction to interpret lactation curves. Canadian Biosystems Engineering/Le génie des biosystèmes au Canada 44: 7.1 7.13. Decision-tree induction was used to learn to interpret paritygroup average lactation curves automatically in dairy farming. Three parity groups were involved consisting of cows in their first, second...
متن کاملProduction evaluation techniques based on lactation curves.
Test day data on milk yield for individual cows were generated using Monte Carlo simulation consisting of 1000 herds. Each herd contained 30 second lactation cows for each of 2 yr. Three scenarios were simulated with increasing effects of test day and seasonality. For each test day, several statistics were calculated for each cow: test day data on yield deviated from expectations, deviated test...
متن کاملDerivation of standard lactation curves for South African dairy cows
Standard Lactation Curves were derived for South African Holstein and Jersey cows, using 20 herd-, 18 ageand six season classes. Six herd classes were below and 13 above the average production level for both breeds. A standard lactation curve was estimated for each combination of herd-, ageand season class, which resulted in 2 160 curves per trait per breed. Variation in Holstein yields was muc...
متن کاملUse of lactation curves for analysis of milk production data.
Nonlinear equations were compared with categorical analysis to account for DIM effects on milk production. Five different models for lactation curves were evaluated. Derived from a multiphasic lactation curve, the selected lactation curve appeared to result in random residuals and performed more consistently than the multiphasic curve. Residuals from the fitting of lactation curves were then us...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1986
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(86)80466-0