title: Effect of ovsynch versus prostaglandin F2αprotocol on estrus response, ovulation rate, timing of ovulation and pregnancy per artificial insemination in Sahiwal cows.
abstract: Sahiwal cow is Bos indicus which is an important dairy breed of tropical and sub-tropical region. Research on reproduction is rare in this breed. The objectives of the present study were to determine the effect of Ovsynch (OVS) versus prostaglandin F2α(PG) protocol on estrus response and its intensity, ovulation rate, timing of ovulation and pregnancy per artificial insemination (AI) in Sahiwal cows. Experimental cows (n = 80) were of mixed parity, lactating, suckled, ≥120 days postpartum with body condition score 3.08 ± 0.34 and 375-475 kg of body weight which were randomly assigned to receive either OVS (n = 46) or PG (n =34) protocol. Cows were inseminated twice at 12 and 24 h after second gonadotropin releasing hormone in the OVS group, and 72 and 84 h after administration of prostaglandin F2αin PG group, respectively. The results revealed that estrus response did not differ (P > 0.05) and was 87% in OVS and 78% in PG cows. Ovulation rate did not differ (P > 0.05) and was 50% in both, OVS and PG cows. The pregnancy per AI did not differ (P > 0.05) and was 43% in OVS compared to 31% in PG cows. It is concluded that estrus response, ovulation rate and pregnancy per AI of OVS protocol is the same as PG in Sahiwal cows.
authors.affiliation: Department of Theriogenology, Faculty of Veterinary Science, University of Veterinary and Animal Sciences, Lahore, Pakistan.
authors.forename: Mubbashar
authors.initials: M
authors.lastname: Hassan
authors.affiliation: Department of Theriogenology, Faculty of Veterinary Science, University of Veterinary and Animal Sciences, Lahore, Pakistan.
authors.forename: Ali
authors.initials: A
authors.lastname: Husnain
authors.affiliation: Department of Theriogenology, Faculty of Veterinary Science, University of Veterinary and Animal Sciences, Lahore, Pakistan.
authors.forename: Muhammad Ilyas
authors.initials: MI
authors.lastname: Naveed
authors.affiliation: Department of Theriogenology, Faculty of Veterinary Science, University of Veterinary and Animal Sciences, Lahore, Pakistan.
authors.forename: Umair
authors.initials: U
authors.lastname: Riaz
authors.affiliation: Department of Theriogenology, Faculty of Veterinary Science, University of Veterinary and Animal Sciences, Lahore, Pakistan.
authors.forename: Nasim
authors.initials: N
authors.lastname: Ahmad
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D015237:Dinoprost / Q000008:administration & dosage / Q000494:pharmacology*; D004973:Estrus Synchronization / Q000187:drug effects*; D005260:Female; D007987:Gonadotropin-Releasing Hormone / Q000008:administration & dosage; D007315:Insemination, Artificial / Q000379:methods / Q000662:veterinary; D010060:Ovulation / Q000187:drug effects*; D011247:Pregnancy; D018873:Pregnancy Rate
chemical_list: D007987:Gonadotropin-Releasing Hormone; D015237:Dinoprost
keywords: Sahiwal cow; ovsynch; pregnancy per AI; prostaglandins; synchronization