Tada Obert, Muchenje Voster, Dzama Kennedy
Department of Livestock and Pasture Science, University of Fort Hare, P. Bag X1314, Alice, 5700 South Africa.
Springerplus. 2013 Apr 30;2(1):195. doi: 10.1186/2193-1801-2-195. Print 2013 Dec.
A cross-sectional study was conducted in communal and small-scale Nguni cattle enterprises to determine preferential traits for improvement under low-input cattle breeding programs. Forty-one farmers participated in ranking six specific traits of breeding bulls and cows. Kruskal-Wallis test and ordinal logistic regression were used to determine mean ranks of traits and odds ratios of predictors (enterprise ownership, gender, farmer age, education level, agriculture training) on specified trait ranks, respectively. Preferential traits for breeding bulls were in the order; aggression and mating behaviour (1.86), tick and disease resistance (1.90), body condition score (2.69), scrotal circumference (4.52), body size and conformation (4.71) and coat colour (5.02). For breeding cows,preferential order were; tick and disease resistance (1.55), reproductive efficiency (2.02), body condition score (3.14), body size and conformation (4.21), coat colour (4.74) and milk yield (5.31). Less old farmers (< 50 years) and those from communal enterprises preferred bull coat colour more than scrotal circumference. Farmers with primary education and those with formal agriculture training had the least odds ratio estimates on the poorly ranked bull coat colour. The informally trained farmers, older age group (> 50 years), females and those from small-scale enterprises had odds ratio estimates less than one for the sixth ranked milk yield in Nguni cows. It was concluded that trait preference in breeding bulls and cows is significantly influenced by socio-economic and demographic factors. It is recommended to consider farmer preferences in trait selection and designing communal breeding programs.
在社区和小规模的恩古尼牛养殖企业中开展了一项横断面研究,以确定低投入养牛育种计划下的优先改良性状。41位农民参与了对种公牛和种母牛六个特定性状的排序。分别使用Kruskal-Wallis检验和有序逻辑回归来确定性状的平均排名以及预测因素(企业所有权、性别、农民年龄、教育水平、农业培训)对特定性状排名的优势比。种公牛的优先性状顺序为:攻击性和交配行为(1.86)、蜱虫和疾病抗性(1.90)、体况评分(2.69)、阴囊周长(4.52)、体型和外形(4.71)以及毛色(5.02)。对于种母牛,优先顺序为:蜱虫和疾病抗性(1.55)、繁殖效率(2.02)、体况评分(3.14)、体型和外形(4.21)、毛色(4.74)以及产奶量(5.31)。年龄较小(<50岁)的农民以及来自社区企业的农民对公牛毛色的偏好超过阴囊周长。接受过小学教育的农民以及接受过正规农业培训的农民对排名靠后的公牛毛色的优势比估计最低。未受过正规培训的农民、年龄较大的群体(>50岁)、女性以及来自小规模企业的农民对恩古尼母牛第六位的产奶量的优势比估计小于1。研究得出结论,种公牛和种母牛的性状偏好受到社会经济和人口因素的显著影响。建议在性状选择和设计社区育种计划时考虑农民的偏好。