Estrus Detection and Synchronization of Dairy Cattle in Large Herds
نویسندگان
چکیده
منابع مشابه
Synchronization of Estrus in Cattle
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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With aim to solve mentioned problems we undertake the induction and synchronization of estrus's by use of "Crestar" (Intervet) preparation in combination with PMSG (Subotica) and prostaglandin's Sinhrogal (ICN Galenika) according to producers recommendation. On the dairy farm 115 cows was treated separately in 4 groups (25, 25, 25 and 40 cows), while on the beef farm were 370 cows in 4 groups (...
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The importance of cats in the Leptospira epidemiology is due to the possibility of transferring leptospirosis to wild and domesticated animals. The purpose of this survey was to determine the prevalence of Leptospira infection in shorthair cats in different location of Mashhad, Iran. Totally, 147 blood samples were taken from 42 (28.57%), 52 (35.37%) and 53 (36.05%) households...
متن کاملPhysiology and Endocrinology: Synchronization of Estrus in Cattle
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)...
متن کاملChronic stress, hormone profiles and estrus intensity in dairy cattle.
The objectives of the present study were to determine if lameness, a model for a natural chronic stressor, affects hormone concentrations in milk prior to estrus and/or the subsequent expression of estrus in the postpartum period. Dairy cows>20 days postpartum were scored for lameness and observed for estrus intensity using a weighted scoring system (>100 points=estrus=Day 0). Increasing lamene...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1974
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(74)84892-7