干旱区生态环境知识资源中心(Arid): Conception rates and calving intervals of different beef breeds at a farm in the semi-arid region of Namibia

Arid

DOI	10.1007/s11250-019-01876-4
	Conception rates and calving intervals of different beef breeds at a farm in the semi-arid region of Namibia
	Samkange, Alaster; Kandiwa, Erick; Mushonga, Borden; Bishi, Alec; Muradzikwa, Erdwin; Madzingira, Oscar
通讯作者	Samkange, Alaster
来源期刊	TROPICAL ANIMAL HEALTH AND PRODUCTION
ISSN	0049-4747
EISSN	1573-7438
出版年	2019
卷号	51 期号:7 页码:1829-1837
英文摘要	A retrospective study from 2004 to 2017 investigated the effect of bull age, cow age and breed on conception rates, and calving intervals of beef cattle at Neudamm farm, Khomas region, Namibia. Bulls ranging from 4 to 14 years of age were used to breed cows up to 17 years of age. A total of 1804 pregnancies were diagnosed in Afrikaner (81.8%), Nguni (14.1%), and Simmental (4.1%) cows. The overall conception rate of beef cattle during the study period was 71.7 +/- 9.5%. The overall conception rate of the Nguni cows (78.3%) was significantly higher than that of the Afrikaner (70.9%) and the Simmental cows (64.9%) (p < 0.05). The age of sires had no effect on overall conception rate in all three breeds (p > 0.05). Afrikaner dams more than 10 years old had the least rate of conception (60.4%, p < 0.05) within that breed category. Nguni dams between four to 10 years had the greatest conception rate (86.5%, p < 0.05). Age of dams had no effect on conception rates in Simmental cattle (p > 0.05). The overall mean length of all calving intervals in the Nguni cows (366 +/- 35 days) was significantly shorter than those of the Afrikaner cows (487 +/- 62 days) and the Simmental cows (484 +/- 110 days) (p < 0.05). The 2013 breeding season produced the highest overall conception rates (similar to 85%), and the 2007 breeding season produced the lowest overall conception rate (similar to 51%). From a fertility point of view, the Nguni breed seemed best suited for the semi-arid conditions which are prevalent in most of Namibia.
英文关键词	Conception rates Calving intervals Nguni Simmental Afrikaner Namibia
类型	Article
语种	英语
国家	Namibia
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000481756800006
WOS关键词	INDIGENOUS CATTLE ; FERTILITY ; REPRODUCTION ; BULL ; COWS ; PERFORMANCE
WOS类目	Agriculture, Dairy & Animal Science ; Veterinary Sciences
WOS研究方向	Agriculture ; Veterinary Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/219131
作者单位	Univ Namibia, Fac Agr & Nat Resources, Sch Vet Med, P Bag 13301,Pioneerspk, Windhoek, Namibia
推荐引用方式 GB/T 7714	Samkange, Alaster,Kandiwa, Erick,Mushonga, Borden,et al. Conception rates and calving intervals of different beef breeds at a farm in the semi-arid region of Namibia[J],2019,51(7):1829-1837.
APA	Samkange, Alaster,Kandiwa, Erick,Mushonga, Borden,Bishi, Alec,Muradzikwa, Erdwin,&Madzingira, Oscar.(2019).Conception rates and calving intervals of different beef breeds at a farm in the semi-arid region of Namibia.TROPICAL ANIMAL HEALTH AND PRODUCTION,51(7),1829-1837.
MLA	Samkange, Alaster,et al."Conception rates and calving intervals of different beef breeds at a farm in the semi-arid region of Namibia".TROPICAL ANIMAL HEALTH AND PRODUCTION 51.7(2019):1829-1837.