An animal feeding trial was conducted on 18 seven-day-old Holstein dairy bull calves weighing 42 ± 3 kg each. Calves were randomly assigned into three groups (n = 6 each). The dietary treatments were as follows: (1) milk and starter for the control group (MS), (2) supplementation of oat hay from week 2 on the basis of milk and starter (MSO2), and (3) supplementation of oat hay from week 6 on th...

Blood samples were taken from 19 double-muscled (DM) and 20 normal (N) bull calves at the ages of 1.5, 2, 2.5, 3, 3.5, 4, 5.5, 6.5 and 9 mo to compare the plasma concentrations of growth hormone and insulin in DM with those in N bull calves and to relate these to differences in growth rate between the two breed groups. Double-muscled bull calves were lighter (P less than .0001) than N calves at...

Computed tomographic (CT) images of the reticulum, rumen, omasum and abomasum of five healthy Holstein-Friesian bull calves were compared with anatomical transverse cadaver sections of the same calves. The calves were scanned in the transverse plane from the 5th thoracic vertebra to the sacrum six times three weeks apart from birth to 105 days of age. Multiplanar reconstruction was used to crea...

Holstein bull calves (n = 120) were fed milk replacers containing 0, 10, or 20% of the formulation (0, 22, or 44% of crude protein) as spray-dried whole egg powder in a 56-d feeding trial. Milk replacer was medicated with oxytetracycline and neomycin and was fed from d 1 to 42 of the study in a phase-fed program. All experimental milk replacers were supplemented with B vitamins, except biotin. ...

Holstein calves weighing less than 20 kg at birth have been noted in Korea. Due to insufficient information, we raised small calves with age-matched normal birth weight Holstein calves and determined body weights before puberty. In addition, 3 single nucleotide polymorphisms (SNPs) of the growth hormone (GH) gene were analyzed. Up to 10 months of age, low birth weight calves were smaller than n...

It was assumed that the industry of beef cattle breeding being created in Krasnodar Territory would meet needs population beef. Due to fact there are not enough cattle, dairy bulls raised and fattened. Positive results obtained case when, along with an increase number fattened livestock animals, their intensive rearing feeding is introduced. In our studies, fattening Holstein Black-and-White bu...

The effects of feeding and intravenous injections of glucose and VFA on blood ghrelin concentrations were investigated in calves before and after weaning. Eight Holstein bull calves were fed whole milk, allowed free access to solid feeds, and weaned at 7 wk. Measurements were carried out at 2, 4, 6, 9, 11, and 13 wk, at which time jugular blood samples were taken from 4 calves through a cathete...

Preweaning data on 486 Angus, Brahman, and reciprocal cross calves (AB, BA) managed on common bermudagrass or endophyte-infected tall fescue were used to evaluate the interactions of forage type and sex of calf with direct effects, individual heterosis, and maternal effects. Calves were spring-born in 1988, 1989, 1990, and 1991 to five sires of each breed. Male calves were castrated at birth, a...

Holstein heifer and bull calves (n = 52) at Ames Plantation (Grand Junction, TN) and Piedmont Research Station (Salisbury, NC) were blocked by sex and assigned randomly to receive 3.8 L of maternal colostrum in one feeding, 1.9 L in two feedings at a 10to 12-h interval, or 1.9 L in two feedings at a 10to 12-h interval plus 272 g of colostrum supplement at the first feeding. The colostrum supple...