Cottonseed meal (CSM) is a by-product of oil extraction from cottonseeds. Though high in protein and fiber, the inclusion of high levels of CSM in the diets of swine is limited due to the anti-nutritional factor, gossypol. Gossypol within CSM has a myriad of negative effects, with the most pronounced being the effect on the male reproductive system. Invasive feral swine have proven to be quite prolific and adaptable in introduced environments and cost the United States of America $1.5 billion in control costs and damages every year. Several mitigation techniques such as recreational hunting, aerial hunting, and toxic baiting have been implemented to lower the impact of feral swine damage. However, given the exponential growth and proliferation of feral swine in the United States of America, these methods have proved insufficient. The goal of this project was to evaluate the efficacy of CSM on semen motility parameters in the most similar animal model of feral swine, domestic boars, as a potential mitigation technique for the cessation of the feral swine population growth within the United States of America. Results at the conclusion of the 10 week feeding trial with 60% inclusion of CSM (Total Gossypol: 0.74%) of the total diet indicate a significant reduction in the semen motility of CSM-treated boars. Total motility for the CSM-treated boars was reduced pre to post treatment, from 79.6% to 60.2% respectively. Progressive motility of the CSM-treated boar ejaculate was reduced from 67.42% to 40.07%. Sperm cell velocity distributions for rapid moving and medium moving cells were also significantly reduced in the CSM-treated boars versus the control group, 18.75%, 40.99% and 32.04%, 45.93% respectively. Sperm cells that exhibited no motility or were static, were observed as being significantly higher in the CSM-fed group than the control, 25.54% and 9.52% respectively. The percentage of slow moving cells within the CSM-fed group were not significantly different however we attribute this to the rapid and dramatic increase in the amount of static cells present in the ejaculate. Implications from this study could provide insight on the antifertility effects of feeding CSM on feral swine ejaculate through the use of domestic boars as an animal model. Therefore, further research is needed to assess the effects of CSM on feral boar ejaculate in-vivo, to be implemented in a mitigation method for the proliferation of the feral swine population within the United States of America.
|Advisor:||Guay, Kimberly A.|
|Commitee:||Roper, David A., Smith, William B.|
|School:||Tarleton State University|
|Department:||Animal Science and Veterinary Technology|
|School Location:||United States -- Texas|
|Source:||MAI 58/05M(E), Masters Abstracts International|
|Subjects:||Wildlife Conservation, Wildlife Management, Animal sciences|
|Keywords:||Boar, Cottonseed meal, Feral swine, Semen motility|
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