Abstract
The study aimed at determining the effects of breed type, breeding season, sex and type of birth on the growth and reproductive traits of lambs. Two ewe breed types (Gellaper and Swakara) and four ram breed types (Damara, Dorper, GeDo and Swakara) were used. Two lambing seasons, spring (March–May) and autumn (September–November), were considered. Gellaper-based lambs born in autumn had higher (P < 0.05) mean birth weight (4.58 kg) compared to spring-born lambs (3.43 kg). Ram lambs were heavier (P < 0.05) than ewe lambs at weaning and post-weaning age. Singletons were heavier than twins (P < 0.05) at birth, weaning and breeding. Single and autumn-born lambs had a higher average daily gain (ADG) than spring-born lambs (P < 0.05). Ram lambs had a higher pre-weaning and overall ADG (P < 0.05) compared with ewe lambs. Swakara-based lambs gained more from weaning to mating compared to Gellaper-based lambs (P < 0.05). The conception, lambing and annual reproductive rate were all influenced by breed type and season (P < 0.05). Swakara-based lambs had higher reproductive capabilities, while Gellaper-based lambs grew faster but take longer to breed type; autumn lambing gave rise to low birth weights but heavier lambs at weaning and post-weaning, hence suitable for mutton production.
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All the authors contributed to the study’s conception and design. Material preparation and data analysis were performed by Soul Washaya, and Clarice Princes Mudzengi. The first draft of the manuscript and data collection were done by Uaipo Ngorio. The data was cleaned and rearranged by Washaya Dorine D., who also reviewed and critically revised the manuscript, and all the authors commented on previous versions of the manuscript. All the authors read and approved the final manuscript.
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Washaya, S., Ngorio, U. & Mudzengi , C.P. Effects of the breeding season, birth type and sex on growth and reproductive performances of sheep breeds. Trop Anim Health Prod 55, 188 (2023). https://doi.org/10.1007/s11250-023-03575-7
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DOI: https://doi.org/10.1007/s11250-023-03575-7