Figure 1.Ayrshire cow. (Photograph courtesy of Mississippi State University.) Brown Swiss The Brown Swiss originated in the cantons (states) of Schwyz, Zug, St Gallen, Glarus, Lucerne and Zurich in Switzerland. It became a prominent breed during the middle of the nineteenth century although its...
The objective was to study the effects of treatments on cow feed intake, live weight, body condition, milk production, dystocia, fertility and calf performance. In addition, the achieved feeding level for non-mature beef–dairy crosses was evaluated. In experiment 1, the AbAy and ChAy cows ...
Within-cow regression of milk-energy yield on age and liveweight. The Nebraska data are for registered cows of the Ayrshire, Guernsey, Holstein, and Jersey breeds, all treated as one group. The lumping of the data ... WL Gaines,HP Davis,R Morgan - 《Journal of Dairy Science》 被引量:...
Calf birth weight was higher (44.2 vs. 35.4 kg) and gestation was longer (297.4 vs. 280.2 d) in Ayrshire dams bearing Limousin fetuses than in those bearing Ayrshire fetuses. Daily milk production for the first 20 wk was lower (18.1 vs. 20.8 kg) in Ayrshire dams bearing Limousin fetuses...
Data on type, body size, breeding efficiency and length of service period of 19 cow families were analyzed by the analysis of variance. Estimates of the variance components were obtained by equating the sample values to the expected sums of squares. The family averages for weight, breeding ...
Genetic correlations between bull/heifer and cow meat production traits varied between 0.20 and 0.68, with higher and positive correlations between corresponding traits in both data subsets. Genetic correlations between bull/heifer meat production traits and cow milk production traits were either ...
Individual and maternal additive genetic and heterotic effects were estimated for preweaning, reproductive, and lactation traits of the Sahiwal breed and its crosses with Bos taurus (Ayrshire and Friesian). The individual additive genetic breed effect influenced all cow traits except annual milk yield,...
body weightIndividual cow test day records collected between December 1979 and June 1986 were used to calculate measures of reproductive performance, age and weight at calving, and days dry for 7824 Ayrshire and 79,755 Holstein cows in first lactation. Separate analyses by breed were carried out ...