BACKGROUND: Many additives have been recommended to calf feed but the effects of each supplement have been under investigation especially during weaning stress. OBJECTIVES: The effects of dietary supplementation of probiotic (Protexin) and chromium-methionine che- late (Cr-Met) on triiodothyronine (T3), thyroxine (T4), total protein, albumin, zinc, and gr...

Data were collected on the heart girth (n = 8,565; a measure of body weight) and height at withers (n = 8,568) of Holstein dairy heifers from 659 dairy farms as part of the National Dairy Heifer Evaluation Project during 1991 and 1992. Means and standard deviations for weight and height were determined for ages .5 to 23.5 mo. Third-order polynomial regression equations were derived to study the...

The present study has been conducted to evaluate the effect of intramuscular administration of vitamin A during dry period in pregnant dairy cows which have already received it in their daily ration on vitamin A status of neonatal calves. Single intramuscular injection of 2000000 IU vitamin A was carried in 10 dairy cows at 7 months of pregnancy (group 1) and in another 10 dairy cows at 8 month...

Abstract Heat resistance depends on the breed of cattle and is important for genetic improvement under heat stress (HS). Study objectives were to investigate using peripheral blood mononuclear cells (PBMCs) hair follicles in beef dairy calves based shock protein (HSP) 70 polymorphisms. The samples from sixty (6-month-old, 30 Hanwoo calves, Holstein calves) collected DNA extraction. HSP70 genoty...

Main results:  In general the colostrum quality (112 g/l I dairy herds of mixed breed is high (50 g colostrum). Older parity cows, cows that smaller quantity of colostrum and cows tha with higher IgG concentration. Reducing colostrum is the most practical means by w  Calves fed 8.5% of birth bodyweight in concentration of IgG in serum in the first 3 Feeding calves transition milk subsequent a...

• Hypomyelination is a rare consequence of in utero BVDV infection cattle. A high prevalence congenital tremor and hypomyelination BVD outbreak described. The complete genome causing reported for the first time. Type number viral genomic mutations differ between brain blood samples. Genetic variability host factors contributed to unusual outbreak. bovine diarrhoea virus (BVDV) infection. We des...

BACKGROUND Bovine respiratory disease (BRD) remains among the leading causes of death of cattle internationally. The objective of this study was to identify risk factors associated with exposure to BRD pathogens during the peri-weaning period (day (d)-14 to d 14 relative to weaning at 0) in dairy bull calves using serological responses to these pathogens as surrogate markers of exposure. Clinic...

This study was conducted to compare the meat qualities of loin (m. longissimus dorsi) and top round (m. semimembranosus) from Hanwoo and Holstein veal. Ten Hanwoo and Holstein calves were randomly selected from a local cattle farm and raised. They were slaughtered when they were 8 mon old and weighed. Weight and percentage in primal cuts and slaughter performance of Hanwoo and Holstein veal cal...

Economic weights (EW) for the Slovak dairy production system were calculated in Holstein, Slovak Simmental, and Slovak Pinzgau breeds under a direct support regime using a bio-economic approach. EW were calculated for three scenarios (A: without agricultural subsidies; B: agricultural subsidies included in revenues and C: agricultural subsidies included in feeding costs). Quota-free milk produc...

Akbar Nikkhah1* and Masoud Alimirzaei2 Author Affiliations 1Chief Highly Distinguished Professor Scientist, National Elite Foundation, Iran 2Behroozi Dairy Complex, Received: February 16, 2022 | Published: 23, Corresponding author: Nikkhah, Chief DOI: 10.26717/BJSTR.2022.42.006702