Results 191 to 200 of about 336,156 (254)
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Control of Estrus and Ovulation in Beef Heifers
Veterinary Clinics of North America - Food Animal Practice, 2013Expanded use of artificial insemination (AI) and/or adoption of emerging reproductive technologies for beef heifers and cows require precise methods of estrous-cycle control. New protocols for inducing and synchronizing a fertile estrus in replacement beef heifers and postpartum beef cows in which progestins are used provide new opportunities for beef ...
Michael F Smith
exaly +3 more sources
Theriogenology, 2020
The objective of the present study was to evaluate the effect of equine chorionic gonadotropin (eCG) administration associated to different proestrus lengths for Fixed-time AI (FTAI) in beef heifers.
R. Núñez–Olivera +8 more
semanticscholar +1 more source
The objective of the present study was to evaluate the effect of equine chorionic gonadotropin (eCG) administration associated to different proestrus lengths for Fixed-time AI (FTAI) in beef heifers.
R. Núñez–Olivera +8 more
semanticscholar +1 more source
Evaluation of the Factors that Affect the Pregnancy Rates During Embryo Transfer in Beef Heifers.
Reproduction in domestic animals = Zuchthygiene, 2020The aim of this study was to evaluate the effects of the transfer side, transfer location, cervix transfer score, type and diameter of corpus luteum (CL) during embryo transfer on pregnancy rates in beef heifers.
H. Alkan +5 more
semanticscholar +1 more source
Theriogenology, 2020
Two experiments were conducted to determine effects of progesterone (P4) on cyclicity, estrus expression rate (EER) and artificial insemination pregnancy rate (AIPR) in beef heifers with various reproductive tract scores (RTS; 1 to 5; 1, immature ...
R. Kasimanickam +3 more
semanticscholar +1 more source
Two experiments were conducted to determine effects of progesterone (P4) on cyclicity, estrus expression rate (EER) and artificial insemination pregnancy rate (AIPR) in beef heifers with various reproductive tract scores (RTS; 1 to 5; 1, immature ...
R. Kasimanickam +3 more
semanticscholar +1 more source
Body composition of beef heifers at puberty
Theriogenology, 1985Three trials were conducted to study age, weight, percent body fat and protein content of 131 crossbred and purebred beef heifers at puberty, to investigate relationships among various pubertal measurements and to determine if body fat and protein values could be used in combination with age, weight and shoulder height to predict the onset of puberty ...
A L, Brooks +2 more
openaire +2 more sources
Factors Affecting Dystocia in Beef Heifers
Journal of the American Veterinary Medical Association, 1972SUMMARY A study was undertaken to evaluate the effect of calf birth weight and dam pelvic area on the occurrence of dystocia in primiparous beef heifers. A pelvimeter was developed to measure the bovine pelvic inlet per rectum. In the 1st trial, ninety 2-year-old primiparous Hereford heifers were weighed and their pelvic areas were measured 3 months ...
L E, Rice, J N, Wiltbank
openaire +2 more sources
Relaxin on Induction of Parturition in Beef Heifers*
Endocrinology, 1986Purified porcine relaxin (3000 U/mg) was administered into the cervical os of primiparous beef heifers on day 278 of gestation (approximately 5 days before parturition normally occurs) to determine its effects on the induction of parturition, changes in progesterone, estrone (E1), 17 beta-estradiol (17 beta-E2), cervical dilation, and pelvic relaxation.
A I, Musah +3 more
openaire +2 more sources
Selenium Supplementation of Beef Heifers
American Association of Bovine Practitioners Conference Proceedings, 1991The objective of the study was to compare the effect of a sustained-release selenium (Se) bolus to an 120 ppm Se salt-mineral mixture on blood Se concentrations in yearling beef heifers.
Swecker, William S. +3 more
openaire +1 more source