Reproduction and adaptation characteristics in D’man sheep

  • A. Lahlou-Kassi Hassan II Agronomic and Veterinary Medicine Institute, P.O. Box 6202, Rabat-Instituts, Morocco
  • S. Benlamlih Hassan II Agronomic and Veterinary Medicine Institute, P.O. Box 6202, Rabat-Instituts, Morocco
  • R. Boukliq Hassan II Agronomic and Veterinary Medicine Institute, P.O. Box 6202, Rabat-Instituts, Morocco

Abstract

D’man breed (D) is found in the oasis of the subsaharian regions of Morocco and reared usually in sedentary type of management with small flocks (< 10 ewes). Preliminary field surveys showed that D is early maturing, prolific and aseasonal. Hence, a multidisciplinary research programme on D was started in 1974. This paper reports the findings of these studies and describes the approach used to (1) characterize and evaluate the performances of D in field and station, (2) study the physiological mechanism involved in its peculiar reproduction and production, (3) study the genetic basis of reproduction parameters, and (4) evaluate use of D in crossbreeding schemes to improve the productivity of other Moroccoan breeds. Results show that D is one of the rare breeds that is simultaneously early maturing, highly prolific and completely aseasonal. However, studies on water turnover and nitrogen recycling show that D is not well adapted to hot climate and poor nutrition. Its reproduction parameters are relatively independent of photoperiod and related to a low sensitivity to negative oestrogen feedback. D male is characterized by high libido and can be used for synchronizing oestruses through the »ram effect». Crossbreeding experiments with non-prolific sheep confirm the heritability of reproductive parameters. However, the genetic basis for these is not yet well known.

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Section
Articles
Published
Oct 1, 1988
How to Cite
Lahlou-Kassi, A., Benlamlih, S., & Boukliq, R. (1988). Reproduction and adaptation characteristics in D’man sheep. Agricultural and Food Science, 60(6), 566-575. https://doi.org/10.23986/afsci.72314