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Abstract
This study evaluated the semen quality of Santa Ines sheep fed diets containing different levels of whole cottonseed (WCS). Twenty sheep were distributed into four groups that were given diets with 0; 20; 30; 40% of WCS. For this study the semen was collected by electroejaculation, and a monthly andrological examination was performed during nine months. The analyzed variables were: scrotal circumference (SC), appearance and color of the ejaculate, progressive motility (PM), vigor, mass movement (MM), total sperm concentration (spzX109), sperm morphology (SM) and blood hematocrit. The SC had no difference among diets, with mean 31.83 cm. The animals fed diets with WCS, presented mean intake of 9.16 mg gossypol kg BW, and were prone to present greenish semen, and appearance ranging from thin creamy to watery. The PM decreased linearly (p < 0.05) with increasing level of WCS, while the vigor had a quadratic trend. The total defects increased linearly in relation to reference values described in literature. The WSC had no influence on hematocrit levels, but did affect the PM and vigor of spermatozoa, thus not recommended to diets of animals for breeding.
Highlights
The use of cotton derivatives in animal feeding is widespread for the good quality of its protein and other components, such as calcium, phosphorus, iron, and vitamins, besides the energy value
One of the main problems when using the whole cottonseed or some of its derivatives is the presence of gossypol, an antinutritional factor
The free form of gossypol is predominant in the whole cottonseed (CALHOUN et al, 1995) but during processing
Summary
The use of cotton derivatives in animal feeding is widespread for the good quality of its protein and other components, such as calcium, phosphorus, iron, and vitamins, besides the energy value. One of the main problems when using the whole cottonseed or some of its derivatives is the presence of gossypol, an antinutritional factor. The free form of gossypol is predominant in the whole cottonseed (CALHOUN et al, 1995) but during processing. Animal Sciences to obtain the meal, the gossypol binds to proteins. Kerr (1989) observed that all gossypol in the whole cottonseed is found in free form and is readily absorbed after intake and acts on the metabolism of amino acids, binding to proteins with free amino. The libido, the sperm production and its fertilization power are attributes that define the reproductive efficiency of the animal, which is subjected to environmental factors, such as temperature, air relative humidity, age, nutrition, and management system (SALGUEIRO; NUNES, 1999). This study evaluated the influence of whole cottonseed on the macroscopic, microscopic and morphology of semen and blood hematocrit of Santa Ines sheep, with breeding age
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