The purpose of this study was to evaluate the effect rumination times and days spent in a close-up group before calving (DCU) on early-lactation health reproductive outcomes dairy cows. Data were gathered for 719 cows located single herd. Herd management records analyzed receiving treatment first 30 d lactation (days milk; DIM) clinical mastitis, tract disease, ketosis, milk fever, displaced ab...

Emphasizing increased profit through increased dairy cow production has revealed a negative relationship of production with fitness and health traits. Decreased cow health can affect herd profitability through increased rates of involuntary culling and decreased or lost milk sales. The development of genomic selection methodologies, with accompanying substantial gains in reliability for low-her...

Twelve lambs, paired on the basis of live weight, were cannulated in the abomasum, in the proximal jejunum approximately 4 m distal to the pylorus and in the terminal ileum. Six were infected with 3000 Trichostrongylus colubriformis and 3000 Ostertagia circumcincta larvae each day for 18 weeks and the remainder were pair-fed to individual infected lambs. All animals were offered ryegrass (Loliu...

Four Texel wethers (60 to 64 kg) fitted with rumen and duodenal cannulae were used to compare methods for estimating mean retention times (MRT) of digesta markers. They were fed, in eight equal meals, 1,200 g of a mixture of a chopped and ground (8-mm screen) and pelleted orchardgrass hay in the ratios 90/10, 50/50, 30/70, or 10/90 according to a 4 x 4 Latin square design. Mean retention time i...

The effect of age on the enzyme potentialities of abomasum (chymosin and pepsin) and pancreas (chymotrypsin, trypsin, lipase, colipase and amylase) was studied in the preruminant calf. Three foetuses were collected after slaughter of their dams (260 d of gestation) and 32 calves were maintained as preruminant and slaughtered between birth and 147 d of age. The abomasal mucosas and pancreata wer...

The objective of this experiment was to assess ruminal outflow and apparent total-tract digestibility using digesta samples from 3 sites (reticulum, omasum, and abomasum) and 3 marker methods (single marker: indigestible NDF [iNDF; sample without separation]; double marker: iNDF + Co-EDTA [filtered sample]; and triple marker: iNDF + ytterbium [Yb] acetate + Co-EDTA [filtered and centrifuged]) i...

I . Effects of feeding liquid milk-substitute to young calves either by nipple-pail or open-bucket o n the rumen by-pass and on the rate of passage were studied. z. Sixteen Holstein calves, aged I week initially, were used in three experiments in which calves were slaughtered after they were given liquids (milk-substituteand water) containingchromic oxide and SrCI, .6H,O as a tracer either by t...