نتایج جستجو برای: estrous synchronization
تعداد نتایج: 43172 فیلتر نتایج به سال:
McKenzie’s laboratory (U. MO; 1930s) described the estrous cycle of domestic animals. Brownell (Cornell; 1936) reported AI and bull bred pregnancy rates were similar. Between 1938 (first, EJ Perry, NJ) and 1940, 54 AI organizations in 21 states were formed. Ulberg, Christian and Casida (1951) controlled time of ovulation in cows with progesterone (P) injected daily. Trimberger and Hansel (1955)...
Aim: The present research work was carried to study the estrus response and conception rate in lactating Ongole cows consequence to double injection of prostaglandin. Material and Methods: Estrus synchronization was performed by double injection of PGF2α (Lutalyse, 5ml/cow) in purposively selected 22 lactating Ongole cows. The 1st injection was administered on 60 days post partum (day 0) follow...
The beef cattle industry has seen rapid gains in economically desirable traits largely due to the selection and expanded use of genetically proven, superior sires made available through artificial insemination (AI). Recent surveys indicate, however less than 5% of the beef cows in the United States are bred by AI, and only half of the cattle producers who practice AI use any form of estrus sync...
Progesterone, or progesterone like compounds, (progestins) have been investigated and used for estrous synchronization for several decades. However, the success rates of programs that use progestins have varied considerably. A primary challenge to the use of this hormone for synchronization was the repeated observation in the past of reduced fertility at the synchronized estrus. Perhaps of even...
Numbers of estrus synchronization programmes are available in cattle based on the use of various hormones like progesterone, prostaglandin F2a and their various combinations with other hormones like estrogen and Gonadotrophin Releasing hormone (GnRH). Selection of appropriate estrus synchronization protocol should be made on the basis of management capabilities and expectations of the farmer. S...
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