Results 161 to 170 of about 148,897 (216)
Some of the next articles are maybe not open access.
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
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
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 ...
David J, Patterson +4 more
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
Developing replacement beef heifers
Theriogenology, 2008The replacement heifer represents the next generation of genetic progress for the cow herd. Producers invest a substantial amount of capital in these females, even if they fail to become pregnant. In order to get a return on this investment, it is imperative that these heifers become pregnant early in the first breeding season, calve with a minimum of ...
openaire +2 more sources
Performance of beef heifers supplemented with sodium lasalocid
Tropical Animal Health and Production, 2016This study was conducted on 78 13-month-old crossbred beef heifers that weighed 215 kg in Southern Rio Grande do Sul (RS) State, Brazil. We evaluated the performance of beef heifers that were reared in a pasture system that received a mineral supplement energy-type protein with added sodium lasalocid (LAS).
Everton Dezordi, Sartori +5 more
openaire +2 more sources
Induced Tritrichomonas foetus infection in beef heifers
Journal of the American Veterinary Medical Association, 1990Summary Four virgin beef heifers were inoculated intravaginally with 7 × 106 Tritrichomonas foetus organisms. Protozoal colonization of the vagina, cervix, and uterus developed within the first week after inoculation. Protozoa were no longer detected in secretions from these regions at approximately the same time in each heifer.
S Z, Skirrow, R H, BonDurant
openaire +2 more sources