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Calving intervals of beef cows treated with either gonadotrophin releasing hormone or a progesterone releasing intravaginal device. 1982

A R Peters

Over a two year period, 436 suckling beef cows were treated either with a progesterone releasing intravaginal device (PRID) for 10 days, or two injections of 0.25 mg gonadotrophin releasing (gn-RH) at an interval of 10 days, or left as controls. Treatment commenced between days 20 and 40 post partum and cows were subsequently mated naturally at oestrus. PRID treated cows showed a more synchronous onset of oestrus than the control or Gn-RH treated cows. There was no overall significant effect of either treatment on the mean calving interval, although in the first year PRID treatment before day 30 post partum reduced the mean calving interval by 12.8 days compared to the controls (P less than 0.05). Neither bodyweight nor body condition score had a significant effect on the calving interval.

UI MeSH Term Description Entries
D007273 Injections, Intramuscular Forceful administration into a muscle of liquid medication, nutrient, or other fluid through a hollow needle piercing the muscle and any tissue covering it. Intramuscular Injections,Injection, Intramuscular,Intramuscular Injection
D010906 Pituitary Hormone-Releasing Hormones Peptides, natural or synthetic, that stimulate the release of PITUITARY HORMONES. They were first isolated from the extracts of the HYPOTHALAMUS; MEDIAN EMINENCE; PITUITARY STALK; and NEUROHYPOPHYSIS. In addition, some hypophysiotropic hormones control pituitary cell differentiation, cell proliferation, and hormone synthesis. Some can act on more than one pituitary hormone. Hormones, Pituitary Hormone Releasing,Hypophysiotropic Hormones,Hypothalamic Hypophysiotropic Hormone,Hypothalamic Releasing Factor,Hypothalamic Releasing Hormone,Hypothalamic Releasing Hormones,Hormone, Hypothalamic Hypophysiotropic,Hormones, Hypophysiotropic,Hypophysiotropic Hormone, Hypothalamic,Pituitary Hormone Releasing Hormones,Releasing Hormone, Hypothalamic
D011247 Pregnancy The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH. Gestation,Pregnancies
D011270 Pregnancy, Animal The process of bearing developing young (EMBRYOS or FETUSES) in utero in non-human mammals, beginning from FERTILIZATION to BIRTH. Animal Pregnancies,Animal Pregnancy,Pregnancies, Animal
D011374 Progesterone The major progestational steroid that is secreted primarily by the CORPUS LUTEUM and the PLACENTA. Progesterone acts on the UTERUS, the MAMMARY GLANDS and the BRAIN. It is required in EMBRYO IMPLANTATION; PREGNANCY maintenance, and the development of mammary tissue for MILK production. Progesterone, converted from PREGNENOLONE, also serves as an intermediate in the biosynthesis of GONADAL STEROID HORMONES and adrenal CORTICOSTEROIDS. Pregnenedione,Progesterone, (13 alpha,17 alpha)-(+-)-Isomer,Progesterone, (17 alpha)-Isomer,Progesterone, (9 beta,10 alpha)-Isomer
D002417 Cattle Domesticated bovine animals of the genus Bos, usually kept on a farm or ranch and used for the production of meat or dairy products or for heavy labor. Beef Cow,Bos grunniens,Bos indicus,Bos indicus Cattle,Bos taurus,Cow,Cow, Domestic,Dairy Cow,Holstein Cow,Indicine Cattle,Taurine Cattle,Taurus Cattle,Yak,Zebu,Beef Cows,Bos indicus Cattles,Cattle, Bos indicus,Cattle, Indicine,Cattle, Taurine,Cattle, Taurus,Cattles, Bos indicus,Cattles, Indicine,Cattles, Taurine,Cattles, Taurus,Cow, Beef,Cow, Dairy,Cow, Holstein,Cows,Dairy Cows,Domestic Cow,Domestic Cows,Indicine Cattles,Taurine Cattles,Taurus Cattles,Yaks,Zebus
D004343 Drug Implants Small containers or pellets of a solid drug implanted in the body to achieve sustained release of the drug. Drug Implant,Drug Pellet,Pellets, Drug,Drug Pellets,Implant, Drug,Implants, Drug,Pellet, Drug
D004973 Estrus Synchronization Occurrence or induction of ESTRUS in all of the females in a group at the same time, applies only to non-primate mammals with ESTROUS CYCLE. Estrus Synchronizations,Synchronization, Estrus,Synchronizations, Estrus
D005260 Female Females
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia

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