title: Towards a shorter calving interval in South African dairy herds.
abstract: The effects of a progestagen treatment regimen on the calving-to-conception period and number of inseminations per conception in a Holstein-Friesland herd [n = 60] were investigated. No significant (P > 0.05) differences were observed in days from calving to conception (80.5 vs. 82.3) and inseminations per conception (1.52 vs. 1.41) between the treatment and the control groups, although the treatment possibly contributed to an improved oestrus detection rate.
authors.affiliation: Highveld Region Agricultural Development Institute, Republic of South Africa.
authors.forename: J G
authors.initials: JG
authors.lastname: van Zyl
authors.forename: J G
authors.initials: JG
authors.lastname: Horn-Quass
authors.forename: A G
authors.initials: AG
authors.lastname: Ross
mesh_terms: D000780:Anestrus / Q000187:drug effects; D000822:Animal Husbandry / Q000379:methods; D000818:Animals; D002417:Cattle; D003612:Dairying; D004971:Estrus / Q000187:drug effects* / Q000502:physiology; D004972:Estrus Detection / Q000662:veterinary; D005260:Female; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000187:drug effects* / Q000502:physiology; D045167:Progesterone Congeners / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D045167:Progesterone Congeners