Conception rate of Pabna cows and heifers bred under artificial insemination and natural service
نویسندگان
چکیده
منابع مشابه
Pregnancy rate and first-service conception rate in Angus heifers.
The objective of this project was to determine the genetic control of conception rate, or pregnancy percentage in Angus beef heifers. Producers from 6 herds in 5 states provided 3,144 heifer records that included breeding dates, breeding contemporary groups, service sires, and pregnancy check information. Two hundred fourteen sires of the heifers were represented; with 104 sires having less tha...
متن کاملComparing First Service Conception Rate Before and After Milking in Holstein Cows
The objective of this study was to comparing first service conception rate before and after milking and changes in metabolite and hormones during four times realted to milking in lactating dairy cow. High producing Holstein cows (> 30 Kg/d and BCS) were randomlly selected and assigned into two groups: 1- insemination before morning milking (0700 a.m, n = 150) and 2- insemination after morni...
متن کاملEffects of GnRH, PGF2α and oxytocin treatments on conception rate at the time of artificial insemination in lactating dairy cows
In several studies, hormones such as gonadotropin-releasing hormone (GnRH), prostaglandins and oxytocin were used to increase pregnancy rate by inducing ovulation and improving the sperm transport in the female reproductive tract in lactating dairy cattle. The objective of this study was to compare the effects of GnRH, prostaglandin F2α (PGF2α) and oxytocin treatments at the time of artificial ...
متن کاملThe Impact of Using Artificial Insemination versus Natural Service for Florida Beef Cows
Introduction Estrous synchronization and artificial insemination (AI) are reproductive management tools that have been available to beef producers for over 40 years. Synchronization of the estrous cycle has the potential to shorten the calving season, increase calf uniformity, and enhance the possibilities for utilizing AI. Artificial insemination allows producers the opportunity to infuse supe...
متن کاملEffect of administration of human chorionic gonadotropin after artificial insemination on concentrations of progesterone and conception rates in beef heifers.
The objective of this study was to determine whether administration of hCG approximately 5 d after AI would increase plasma progesterone concentrations and conception rates in beef heifers. Heifers from two locations (Location 1: n = 347, BW = 367 +/- 1.72 kg; Location 2: n = 246, BW = 408 +/- 2.35 kg) received melengestrol acetate (0.5 mg.heifer(-1).d(-1)) for 14 d and an injection of PGF2alph...
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ژورنال
عنوان ژورنال: Asian-Australasian Journal of Animal Sciences
سال: 1997
ISSN: 1011-2367,1976-5517
DOI: 10.5713/ajas.1997.329