title: Reproductive performance of Farafra ewes in the subtropics.
abstract: The present study was carried out to assess the reproductive performance of Farafra ewes--a breed with potential economic importance in the subtropics. A total of 262 ewes were categorized according to age, parity, and postpartum interval. Ewes were introduced for breeding in fall, winter and late spring seasons. Fertility, prolificacy, lamb birth weight, and ultrasonic fetal parameters were recorded. Results obtained showed that litter size was increased with age and parity. Lamb birth weight was affected by season. None of the parameters studied had a clear-cut effect on fertility. However, an interaction between season and parity was detected. Measurement of fetal size in the first half of gestation did not predict birth weight. The obtained data represents the first record of the reproductive performance of Farafra ewes in the subtropics, which could be used to anticipate their performance in different seasons.
authors.affiliation: Department Theriogenology, Faculty of Veterinary Medicine, Assiut University, 71526 Assiut, Egypt. ahmedali77@hotmail.com
authors.forename: A
authors.initials: A
authors.lastname: Ali
authors.forename: M
authors.initials: M
authors.lastname: Hayder
authors.forename: R
authors.initials: R
authors.lastname: Derar
mesh_terms: D000375:Aging; D000818:Animals; D001724:Birth Weight; D001947:Breeding; D002980:Climate; D004534:Egypt; D005260:Female; D005298:Fertility; D047109:Fetal Development; D008098:Litter Size; D010298:Parity; D049590:Postpartum Period; D011247:Pregnancy; D012098:Reproduction; D012621:Seasons; D012756:Sheep / Q000502:physiology*; D013997:Time Factors