Mean transferrin and lactoferrin concentrations in whey samples from 376 uninfected quarters of 42 Holstein X Friesian cows on the 30th, 150th and 270th days of lactation were respectively 0.030 and 0.080 mg/ml. The mean transferrin concentration in serum was 4.63 mg/ml. Lactation number and location of quarters did not influence milk lactoferrin and transferrin values. Lactoferrin concentratio...

In order to provide uniqe insight into the metabolic disturbences seen after calving cholesterol, triglycerid, high density lipoprotein, low density lipoprotein, very low density lipoprotein, glucose and insulin levels in serum were studied before calving (group I), in aerly (group II) and late (group III) lactation in 24 normal cows. Serum lipoproteins were separeted into various density class...

Data on 657 lactation from 163 Maltese goat, collected over a 5-year period were analyzed by a mixed model to estimate the variance components for heritability. The considered lactation traits were: milk yield (MY) and lactation length (LL). Year, parity and type of birth (single or twin) were significant sources of variation for lactation length; on the other hand milk yield was significantly ...

Since lactation is one of the most metabolically demanding states in adult female mammals, beautifully complex regulatory mechanisms are in place to time lactation to begin after birth and cease when the neonate is weaned. Lactation is regulated by numerous different homeorhetic factors, all of them tightly coordinated with the demands of milk production. Emerging evidence support that among th...

The studies were carried out on cows of Holstein black-and-white breed. 2 groups 10 heads each formed. milk yield for lactation was thousand kg in the first group, and - 5 second group. Blood collected from subcaudal vein monthly during lactation. T 3 4 determined blood serum. functional “load” thyroid gland performed at peak (3 months) its end 9 months. TSH preparation a dose 0.5 u/kg live wei...

Previous experiments have indicated that reproductive function in lean, modern genotypes may be more dependent on body protein mass than, as previously believed, on body lipid reserves. This was investigated in a 3 x 2 factorial arrangement of treatments, involving 60 first-parity sows, comparing three pregnancy feeding strategies and two lactation diets. During pregnancy, sows were fed either ...

The results of the studies showed that by prolactin gene (PRL), highest yield was found in first-calf heifers with PRLBB genotype 4.7% -10.5% as compared to herd-mates other genotypes; and cows second third lactations – PRLAB 2.6-10.6%. In terms milk fat, animals had a higher rate than PRLAA genotypes 0.04-0.17 pp, especially lactation having most noticeable changes. By beta-lactoglobulin (BLG)...

The aim of this study was to investigate the effect season, production status, stage lactation, and parity on milk yield, composition physico-chemical parameters ghee in forty crossbred cows (CBCs). Milk samples were collected from individual animal during morning both summer (May-August) winter (November-February) season. results revealed that yield significantly influenced by status lactation...

percentages and yields of fat, crude protein (cp), true protein (tp) and non-protein nitrogen (npn) wereassessed in milk of four groups of holstein cows, at early, mid and late lactation (days in milk 20-70, 71-110, 111-150 and 151-210), on a diet rich in concentrates during a hot summer. four milk samples were taken from individual cows at 10-day intervals. milk fat percentages were close to b...