Reproductive performance of camels (Camelus dromedarius) under pastoral management and its influence on herd development

Camels (Camelus dromedarius) produce milk and offspring and provide transport in pastoral husbandry systems in the Afro-Asian dryland belt. The aim of the present study was to investigate the reproductive performance of camels kept under pastoral management in northern Kenya. Using the Progeny History surveying technique, data were collected from 471, 287 and 416 adult Rendille, Gabra and Somali female camels including data on 1506, 789 and 1206 parturitions, respectively. Surveys took place from January to December 1995, but data refer to the 15-year production period preceding the survey. Age at first calving (AFC) was 58.4 +/- 1.0 months (LSMeans +/- S.E.), 63.0 +/- 1.1 months and 68.4 +/- 1.3 months for the Somali, Rendille and Gabra camels, respectively. The mean calving interval was similar for all three populations with 27.3 +/- 0.6 months (LSMeans +/- S.E.) for Rendille camels, 28.0 +/- 0.6 months for Gabra (n=500) and 28.4 +/- 0.6 months for Somali camels. The annual calving rate varied between 33% and 46% in the Somali, 19% and 44% in the Gabra and 8% and 86% in the Rendille camel population. Calf mortality rate averaged 25%, 22% and 27% in Rendille, Gabra and Somali camel calves, respectively, and showed highest variation between the years in the Rendille system (5% to 60%). The number of adult breeding females increased by about 20% over a simulation period of 10 years using the status quo reproductive parameters and by about 70% with improved AFC and Cl (excluding AFC > 78 months and CI > 36 months). The results reveal the usual and unusual variation in the reproductive parameters over different years and in the different systems. It is concluded that eliminating unusual variation is a promising way to enhance herd development and reduce risk in the production systems. (c) 2004 Elsevier B.V. All rights reserved.