科研之友
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摘要
The objectives of this study were to measure culling frequency and analysis of reasons for boar culling in commercial boar studs. Data were obtained from nine commercial boar studs included 2342 culled boars in Southern China during July 2013 to June 2016. Descriptive statistics of reasons for boar culling revealed that the frequency of unplanned cull boar accounted for a large proportion (88.04%), reproductive disorders (40.61%) and lameness (27.2%) were the most frequently cited reasons. Sperm-related problems accounted for the largest proportion (668, 70.24%) due to reproductive disorders, followed by the abnormal genital system (169, 17.78%). The highest frequency of reproductive disorders was arisen in May (17.98%), and the relatively high culling frequency lasted for 16 weeks until August (10.00%), especially for the Yorkshire boar that owned highest culling risk (47.09%) with the culled number reached peak in May (60, 21.82%), followed by July (33, 12.00%). In addition, the highest frequency of boar culling due to lameness appeared in May (90, 14.13%), followed by January (68, 10.68%) and December (66, 10.36%) with cold and wet. It was speculated that extreme weather was more likely to cause lameness. Our research suggested farmers under subtropical climate should take effective measures to reduce heat and humidity stress at the earliest, preferably from late spring to August to improve reproductive efficiency on boar studs and also take breed differences into their decision-making processes to ensure adequate boar power and customer satisfaction.
- 出版日期2020-3
- 单位佛山科学技术学院
