نتایج جستجو برای: iranian holstein dairy cattle
تعداد نتایج: 131229 فیلتر نتایج به سال:
Holstein is known to provide higher milk yields than most other cattle breeds, and the dominant position of Holstein today is the result of various selection pressures. Holstein cattle have undergone intensive selection for milk production in recent decades, which has left genome-wide footprints of domestication. To further characterize the bovine genome, we performed whole-genome resequencing ...
Abstract: In order to investigate the seroprevalence of Neospora caninum infection in cattle in Southwestern Iran, blood samples were collected from Holstein (121 animals) and cross-breed (436 animals) cattle from three farms and seven areas of Ahvaz, respectively. All of the Holstein cattle were “4 years old but cross-breed cattle were from different age groups ( < 2, 2-4, 5-6 and > 6 years ol...
Abstract This article presents the results of level feeding and health status dairy cows in a commercial farm on content main components milk (fat, protein, urea). The aim research was to study productivity composition cows, analyze basic nutrients diet farm. breeds purebred Holstein cattle with high genetic potential for productivity. milking herd formed 2009 basis 600 heads Holstein-Friesian ...
Feeding dairy beef, predominantly Holstein steers, has evolved into a highly specialized segment of the US beef industry. Producing acceptable-quality carcasses from dairy steers requires feeding high-energy diets and marketing them at a young age, 12 to 14 months, and weighing 1150 to 1300 lbs. Several aspects of the dairy beef program are unique compared with beef cattle. The calves are not r...
Hair may be a useful matrix to detect cumulative cortisol concentrations in studies of animal welfare and chronic stress. The aim of this study was to validate a protocol for cortisol detection in hair from dairy cattle by enzyme immunoassay (EIA). Seventeen adult Holstein-Friesian dairy cows were used during the milking period. Hair cortisol concentration was assessed in 25-day-old hair sample...
Impaired fertility is the main reason for involuntary culling of dairy cows in Sweden. The objective of this study was to map quantitative trait loci (QTL) influencing fertility and calving traits in the Swedish dairy cattle population. The traits analyzed were number of inseminations, 56-d nonreturn rate, interval from calving to first insemination, fertility treatments, heat intensity score, ...
The objective of this study was to evaluate the effect of temperature-humidity index (THI) on the milk coagulation properties of Holstein-Friesian dairy cattle from northeast part of Italy. A total of 592 individual milk samples from six dairy herds were evaluated. The milk coagulation properties traits analysed were milk rennet coagulation time and curd firmness, as well as the fat, protein, a...
Traditional selection based on genetic merit calculated from phenotypic and pedigree information has been tremendously effective at improving production in dairy cattle. Hypothetically, genetic improvement could be accelerated even further for yield and other economically important traits by directly selecting upon the genetic differences underlying the phenotypes. To elucidate these genetic di...
This research was conducted with the aim of genetically analyzing of raw (RM) and energy-corrected (EC) test day milk in Iranian first lactation Holstein cows. A total of 774,013 test day records belonging to 88,456 first-parity Holsteins (three times milking a day) calving during 1997-2009 in 165 herds (six provinces) was used. Genetic analysis was carried out by a fixed regression test day mo...
BACKGROUND: Cardiovascular system is a very importantorgan that plays a vital role in tissue function. In farm animals,the growth and high milk production depends on function ofcardiovascular system. OBJECTIVES: Cardiovascular health inhigh and low-yielding dairy cows was investigated. METHODS:Fifty 4-year-old high- yielding Holstein dairy cows and fifty 4-year-old low- yielding Holstein dairy ...
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