polymorphism of the b-lactoglobulin (b-lg) gene in 101 cows belonging to the holstein herd and a superior cow, producing more than 150 kg milk/day, together with four offsprings was investigated by the polymerase chain reaction-restriction fragment length polymorphism (pcr-rflp) method. in the holstein herd, the alleles a and b of the b-lg gene had frequencies of 0.53 and 0.47, respectively. th...

Heat stress has profound negative effects in lactating cows, and some of that response is due to depressed dry matter intake (Collier et al., 2006). Recent evidence suggests that other physiological insults related to the heat are responsible for the remaining negative effects on yield, which indicates that alternate coping mechanisms are active in the cow that may affect other production endpo...

AIM The objective of this study was to investigate the ability of infrared thermography (IRT) technique and its interrelationship with conventional mastitis indicators for the early detection of mastitis in Holstein Friesian (HF) crossbred cows. MATERIALS AND METHODS A total of 76 quarters of lactating HF crossbred (Bos indicus × Bos taurus) cows (n=19) were monitored for body temperature (i....

We evaluated the effect of supplementing typical dairy diets with yeast and fibrolytic enzymes on dairy cow performance. Twentyfour Holstein cows were used to evaluate the effects of yeast (Procreatin-7, a live culture of Saccharomyces cerevisiae) and various amounts of FP800 (a fibrolytic enzyme mixture) on lactation performance. Treatments were arranged in a 4 × 2 factorial design consisting ...

The effect of cow genetic merit on the performance of spring calving Holstein Friesian dairy cows in first, second and third lactation was investigated. The study contained 96 first lactation animals in 1995, 96 second lactation animals in 1996, and 72 third lactation animals in 1997. Half of the animals were of high genetic merit (HG) and half of medium genetic merit (MG) for milk production. ...

Presented here is a draft genome sequence for Staphylococcus agnetis CBMRN 20813338, isolated from a lactating dairy cow with subclinical mastitis. The genome is approximately 2,416 kb and has 35.79% G+C content. Analysis of the deduced open reading frame (ORF) set identified candidate virulence attributes in addition to potential molecular targets for species identification.

Dairy cattle predicted by genomic breeding values to be heat tolerant are known have less milk production decline and lower core body temperature increases in response elevated temperatures. In a study conducted at the University of Melbourne’s Dookie Robotic Farm during summer, we identified 20 most heat-susceptible heat-tolerant cows herd 150 Holstein Friesian lactating based on their phenoty...

Abstract Nitrate may reduce the ruminal methane emission by competing methanogenesis to achieve more hydrogen. For this purpose, twenty Holstein lactating cows were examined using a 2×2 factorial design in 4 groups for 60 days with two forage levels (40% and 60%) supplemental nitrate 0% (F40 F60) 3.5% (F40N F60N) of diet dry matter (DM). Then, effect on cow performance, fermentation, emission, ...

The contents of six vitamin B6 forms, pyridoxine-β-glucoside, and 4-pyridoxic acid in mature milk of 20 Japanese lactating women consuming ordinary Japanese foods were determined by a 4-pyridoxolactone-conversion HPLC method. These compounds were determined with the average recovery rate of 83.9% or more. The average total content of vitamin B6 forms was 1.01 ± 0.32 (µmol/L). Pyridoxal and pyri...