Group housing of preweaned dairy calves is a growing practice in the United States. The objective of this practice is to increase the average daily gain of calves in a healthy and humane environment while reducing labor requirements. However, feeding protocols, commingling of calves, and occurrence of disease in different calf-housing systems may affect the prevalence of antimicrobial drug-resi...

The illness of the calves during suckling period suppresses growth and causes them to be removed from breeders. In present study, it was investigated whether Juniper aromatic water (JOW) would suitable for promoting healthy performance Holstein calves. Twelve newborn (n=3, in each group) were randomly selected assigned following four treatments: Control, 50, 100 200 ml JOW supplemented milk per...

The aim of this study was to investigate the effects of a medical plant mixture and a probiotic on performance, antioxidant activity and weaning age of suckling Holstein calves. For this experiment, 30 newborn calves (0-10 days of age) with an average birth weight of 42 ± 8 kg were used in a factorial design (3×2) with 6 treatments and 5 replicates. Treatments were: 1) basal diet including a ca...

Isolation, Molecular Identification, and Antibiotic Resistance Profile of Salmonella Typhimurium Isolated from Calves Fecal Samples Dairy Farms in Hamedan

This experiment was designed to determine the effects of Colostrometer tested colostrum on the total serum protein (TP) of Holstein heifer calves. The experiment was performed on a working dairy where 40 50% of the heifer calves had been dying because of poor colostrum quality. For three months, May 12, 1999 through August 10, 1999, the heifer calves born were fed 4 L of first colostrum through...

The objectives of the current research were to determine the effect of weaning on fecal shedding of Salmonella and Escherichia coli O157:H7 in dairy calves and to examine cultured isolates (to include Enterococcus) for antimicrobial susceptibility. This research was conducted on one large commercial dairy (>3000 head) in the southwestern United States. Two collections were made, during the wint...

There is growing interest among the public in farm animal welfare and a need for methods to assess animal welfare on farm. A survey on calf rearing practices that might affect dairy calf welfare was performed via a 1-h interview on 115 dairy farms (mean +/- SD: herd size=52.5+/-20.9 cows; milk production=8,697+/-1,153L) distributed throughout the province of Quebec. Despite frequent recommendat...

The prevalence of Cryptosporidium in calves younger than 10 weeks was estimated in a cross-sectional epidemiological study on 100 dairy (n=499) and 50 beef (n=333) farms in East Flanders (Belgium), using a previously evaluated immunofluorescence assay (Merifluor). The calf prevalence was 37% (95% Probability Interval (PI): 7-70%) in dairy calves and 12% (95% PI: 1-30%) in beef calves. To elucid...

Eight calves were derived from differentiated cells of a single adult cow, five from cumulus cells and three from oviductal cells out of 10 embryos transferred to surrogate cows (80 percent success). All calves were visibly normal, but four died at or soon after birth from environmental causes, and postmortem analysis revealed no abnormality. These results show that bovine cumulus and oviductal...

In September 2001, satellite tags were deployed on 21 southern right whales (Eubalaena australis) in South African coastal waters, including eight cows accompanied by newborn calves. To date there have been 26 re-sightings of 11 these individuals (or their calves) at intervals 27-1,502 days. So far, 85.7% the females with calves re-sighted a second calf, comparable to those that same showed bef...