Abstract
The effect of nutritional stress on sperm motion characteristics and sexual behaviour of rams in a semi-arid tropical environment
Highlights
A large proportion of the sheep population is sustained in hot, arid and semi-arid regions
There was no significant effect of nutritional stress on semen volume, Table 2
Kishk (2008) reported that testosterone level of Rahmani rams negatively correleated with reaction time and positively correlated with semen volume, sperm motility and sperm concentration which is in agreement with the findings of the present study in which we found decrease in testosterone level with feed restrictions
Summary
A large proportion of the sheep population is sustained in hot, arid and semi-arid regions. Low input extensive grazing is an integral part of sheep rearing in semi-arid tropical regions. Under an extensive system of management, the level of nutrition has a more severe impact on ram reproduction than the photoperiod (Mukasa-Mugerva and Ezaz, 1992; Perez et al, 1997). In this management system, lack of adequate year-round feed resources is probably major factor in low animal production in arid and semi-arid regions in the world (Ben Salem and Smith, 2008; Kawas et al, 2010)
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