Administration of recombinant bovine somatotropin prior to fixed-time artificial insemination and the effects on fertility, embryo, and fetal size in beef heifers
نویسندگان
چکیده
منابع مشابه
Effects of bovine somatotropin administration on growth, physiological, and reproductive responses of replacement beef heifers.
This experiment compared growth, body composition, plasma IGF-I and leptin, and reproductive development of beef heifers receiving or not recombinant bovine ST (BST) beginning after weaning until the first breeding season. Fifty Angus × Hereford heifers (initial BW = 219 ± 2 kg; initial age = 208 ± 2 d), weaned at approximately 6 mo of age, were assigned to the experiment (d 0 to 210). On d 0, ...
متن کاملthe effects of time planning and task complexity on accuracy of narrative task performance
هدف اصلی این تحقیق بررسی تاثیر برنامه ریزی زمانی، هم چنین افزایش میزان پیچیدگی تکالیف در نظر گرفته شده بصورت همزمان، بر دقت و صحت و پیچیدگی عملکرد نوشتاری زبان آموزان می باشد. بدین منظور، 50 نفر از دانش آموزان دختر در رده ی سنی 16 الی 18 سال به عنوان شرکت کنندگان در این زمینه ی تحقیق در نظر گرفته شدند و به دو گروه آزمایشی و کنترل بصورت اتفاقی تقسیم شدند. اعضای گروه آزمایشی هر دو تکلیف ساده و پی...
The Effects of Biweekly Administration of Recombinant Bovine Somatotropin During the First Trimester on Fetal and Placental Development in Beef Heifers
A total of 97 Angus-based crossbred beef heifers were exposed to the 7-day CO-Synch + CIDR estrus synchronization control protocol and then artificially inseminated. At fixed-time artificial insemination (TAI; d 0) heifers were randomly assigned to receive one of two treatments: single subcutaneous injection with 500 mg of bST in the neck at TAI and then biweekly until day 57 of the experiment ...
متن کاملFixed-time artificial insemination in beef cattle
BACKGROUND The study was designed to test the effect of fixed-time artificial insemination (fixed-AI) after the slightly modified Ovsynch protocol on the pregnancy rate in beef cattle in Finnish field conditions. The modification was aimed to optimize the number of offsprings per AI dose. METHODS Ninety Charolais cows and heifers were entered into the program an average of 1.8 times. Thus, 16...
متن کاملNorgestomet implants synchronize estrus and enhance fertility in beef heifers subsequent to a timed artificial insemination.
Three trials involving 128 heifers were conducted to determine whether norgestomet implants administered during the mid- and late luteal phases after breeding could be used to synchronize a second estrus in nonpregnant, inseminated heifers without adversely affecting pregnancy in pregnant heifers. All heifers were initially synchronized with Syncro-Mate B and artificially inseminated 47 h after...
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ژورنال
عنوان ژورنال: Journal of Animal Science
سال: 2018
ISSN: 0021-8812,1525-3163
DOI: 10.1093/jas/sky077