The kinetics of endogenous urea were compared during the last month of pregnancy, lactation, and a nonpregnant, nonlactating control period in Sardi sheep kept on a constant feed level. Urea entry rate estimated by injections of [14C]urea rose by 36% during pregnancy. Renal urea excretion was reduced by 40% during pregnancy and by 28% during lactation. Consequently, fractional urea recycling wa...

The aim of the present study was to investigate the whey proteins profile of raw donkey’s milk from an autochthonous Domestic Balkan donkey breed during the lactation period from 45 to 200 days. The following parameters were determined: whey proteins, alpha-lactalbumin, beta-lactoglobulin, lysozyme and lactoferrin. A technique use for determination of the protein profile is chip-based separatio...

The Ural type of the domestic Black-and-White mottled breed is characterized high milk-yield rates and good suitability for industrial milking technology. milk yield increase led to a deterioration reproductive functions in livestock. As result research it was found that process prolonged using cattle, cows regularly changes, reaching highest among mature by 3rd lactation, then gradually decrea...

We have studied the morphological and quantitative aspects of the myenteric plexus neurons of the proximal colon in rats (Rattus norvegicus of Wistar strain) submitted to a protein deprivation during prenatal and lactation periods. Twenty pregnant dams were divided in four groups labeled according to the kind of nourishment they were given: Group NN, normal diet; Group DN, low protein diet duri...

JUOZAITIENE, V., A. JUOZAITIS: The influence of somatic cell count in milk on reproductive traits and production of Black-and-White cows. Vet. arhiv 75, 407414, 2005. ABSTRACT The aim of this study was to estimate the relationships between somatic cell count in milk, reproduction traits and milk production of cows of the Black-and-White breed. The research was carried out on 412 herds of the ac...

A study was conducted to monitor changes in cortical bone mineral in the dairy cow in response to demands of lactation and pregnancy using rib bone biopsies in serial sampling. Sixteen Friesian cows from the University dairy herd were used to collect 9 samples during the lactation period and 5 samples during the dry period. The data were analysed using a split-plot design analysis of variance. ...

the genetic parameters for milk production and milk fat traits for first to third parities were estimated using single, multi trait and repeatability models. the genetic parameters for test day milk records were also estimated using random regression model. the test day records and 305 day milk records of 17055 cows from 10 herds collected between years 1996-2007 in khorasan razavi province wer...

The transition period for dairy cows, which refers to the time from 3 weeks before through 3 weeks after calving, is now recognized as the most critical phase of the lactation cycle (Drackley , 1999) . Nutrition and management during this period essentially determine the profitability of th e cow for the remainder of the lactation . A problem-filled transition gets cows off to a poor start to l...

The objectives were to determine the effect of administering recombinant bovine ST (bST) every 14 d on milk yield and milk composition in dairy ewes and to assess the possible effects of treatment on milk yield loss that occurs at lamb weaning. Seventy-two lactating dairy ewes were separated into 4 groups at lambing, and each group received no bST (control) or 40, 80, or 120 mg of bST every 14 ...

The Ural type of the domestic black-and-white breed is characterized by high productivity and good suitability for use in conditions industrial milk technology. During its breeding, purebred bulls-producers Holstein both foreign breeding continues. As a result conducted research, it was found that cows changes significantly with age. Milk yield 305 days lactation increases from 1 to 3 lactation...