美系短角肉种牛生长发育性能测定     

祝勤英  杨勇  杨国荣  姚新荣  朱胜全 《中国牛业科学》2012,38(2):15-17

[目的]为了确保美系短角牛选育及推广利用工作顺利进行。[方法]对云南省种羊场扩繁选育的全日制放牧条件下短角牛进行体重、体尺测定。采用牛体重、体尺测定的常规方法,分别测定初生、6月龄、12月龄、18月龄、24月龄、36月龄和成年等不同发育阶段公母牛的体重和体尺。[结果]短角牛种公牛有两个增重高峰,分别是从初生到6月龄和从36月龄到成年;而短角牛母牛的增重从初生到12月龄增重为最快,以后的增重速度变慢。成年公牛体重821.56±62.67kg,体高143.44±5.00cm,体斜长172.89±7.85cm,胸围207.50±7.98cm;母牛分别为543.14±45.20kg,135.34±4.56cm,160.59±7.90cm和187.96±7.20cm。[结论]美系短角牛在云南省种羊场生长发育良好,具备了一定的供种能力。  相似文献   

建立短角牛焦虫病带病免疫功能的探讨     

王龙  陈松  赵仕峰  李维游 《中国牛业科学》2000,26(5):24-26

在保证低死亡率的前提下,让牛只不断受蜱侵袭,使牛只体内对焦虫病尽快呈低带虫状态,中群发病率逐年下降。通过３～５年的时间,可建立全群的焦虫病带虫免疫功能后;在不发生埤的超量感染或对牛只影响较大的不利因素的情况下;牛群不会再暴发焦虫病。  相似文献   

短角牛级进杂交云南富源山地黄牛的效果观测     

李祥  胡建宏 《中国牛业科学》2005,31(1):25-27

2000～2002年集中观测了3代短角牛级进杂交云南富源山地黄牛的改良效果,测定了本地黄牛和短本F1、F2、F3的的初生、6月龄、12月龄、24月龄公母牛的体尺、体重,并选择6月龄断奶牛进行育肥测定,结果显示:日增重短本F1、F2、F3分别比本地黄牛提高469.1g、603.1g和648.4g。代与代之间的改进提高幅度依次为:F1>F2>F3。  相似文献   

Comparisons of the resistance to Japanese theileriosis among Santa Gertrudis × Japanese Shorthorn F₁, Japanese Shorthorn and their reciprocal crosses     

Mikito HIGUCHI  Hirofumi HANADA  Yoshitaka NAGAMINE  Takashi AWATA 《Animal Science Journal》2003,74(6):477-482

To improve the resistance of Japanese Shorthorn (JS) calves to the hemoprotozoan parasite Theileria sergenti (Ts), Santa Gertrudis (SG) × JS F₁ and its reciprocal backcross (F₁ × JS and JS × F₁) calves were produced. All the calves were born from February to April and kept on pasture with their dams from May to October. Blood samples were collected biweekly until 18 weeks of grazing and two indices of resistance to the parasite, percentage of parasitized erythrocytes (PE) and hematocrit value (Ht) were monitored. There was a weak negative correlation between daily gain (DG) on pasture and the average PE (P < 0.1), and was a significantly positive correlation between DG on pasture and the average Ht (P < 0.01) in the experimental period. Although maximum PE observed at six or eight weeks of grazing period was not significantly different among the four mating types, SG × JS F₁ calves exhibited a significantly larger decrease in PE compared to purebred JS after the peak PE. F₁ calves also showed maximum Ht through the grazing period. There were no apparent differences in the two indices among the two reciprocal backcrosses and purebred JS. These results indicated that Ts infection and subsequent decrease in Ht affected the DG of calves in the grassland. The present study also demonstrated that the introduction of the SG gene into JS was effective at the F₁ level in regard to the resistance to theileriosis, and that in the backcrosses an improvement in resistance could not be expected.  相似文献   

短角、安格斯两品种公牛繁殖性能分析     

刘绍贵  欧阳晓芳 《中国牛业科学》2005,31(1):35-36

短角(DJ)、安格斯(AG)牛原产于英国[1];一九九六年云南省家畜冷冻精液站从澳大利亚分别引进DJ、AG种公牛各4头,一九九七年对8头种公牛采精均获得成功,经过对两品种公牛繁殖性能及适应性分析,DJ种公牛较AG种公牛表现出较明显的优势。  相似文献   

Changes in concentrations of plasma metabolites and insulin-like growth factor-1 after feeding in Japanese Black and Japanese Shorthorn cattle     

Yoshihito SUDA  Hisashi SHINOHARA  Ken-ichi YOSHIOKA  Kazuki NAKAGAWA  Takashi CHIBA  Fumihiro YUSA  Akira NIHEI  Akira NISHIDA  Toshihiro YAMAGISHI 《Animal Science Journal》2003,74(6):493-497

The aim was to characterize the changes of plasma component concentrations after feeding in Japanese Black (B) and Japanese Shorthorn (S) cattle. Eight females, five B and three S, with a mean bodyweight (standard deviation) of 282.0 (20.3) kg were selected and supplied with only water for 28 h after feeding. Blood was taken from the jugular vein at 4‐h intervals for 32 h after feeding. Metabolite (cholesterol, CL; glucose, GLU; nonesterified fatty acid, NEFA; triacylglycerol, TG; total protein, TP) and insulin‐like growth factor‐1 (IGF‐1) concentrations in plasma were measured. In both breeds GLU tended to decrease linearly with a similar slope. Differences between the initial mean NEFA at 4 h after feeding (Start) and that at 24 h after the start (End) were significant in both breeds, but S increased significantly more than B at and after 8 h from the Start. The TG in S tended to change more than in B, and CL and IGF‐1 in both breeds changed continuously at similar levels. The TP in B tended to decrease more slowly and be lower than S. The change in NEFA, especially, suggests that nutritional status sensitively reflects genetic background.  相似文献   

Evaluation of inbreeding and genetic diversity in Japanese Shorthorn cattle by pedigree analysis     

Yoshinobu Uemoto  Keiichi Suzuki  Jumpei Yasuda  Sanggun Roh  Masahiro Satoh 《Animal Science Journal》2021,92(1):e13643

The Japanese Shorthorn is a Japanese Wagyu breed maintained at a small population size. We assessed the degree of inbreeding and genetic diversity among Japanese Shorthorn cattle using pedigree analysis. We analyzed the pedigree records of registered Japanese Shorthorn born between 1980 and 2018, after evaluating the pedigree completeness. The average of the actual inbreeding coefficients increased at the same rates annually from approximately 1.5% in 1980 to 4.2% in 2018 and was higher than the expected inbreeding coefficients over time. The effective population size based on the individual coancestry rate largely decreased from 127.8 in 1980 to 82.6 in 1999, and then remained almost constant at approximately 90. Three effective numbers of ancestors decreased over time until 1995, then remained almost constant. In particular, the effective number of founder genomes (N_ge) decreased from 43.8 in 1980 to 11.9 in 2018. The index of genetic diversity based on N_ge decreased from 0.99 in 1980 to 0.96 in 2018 due to genetic drift in non-founder generations. Changes in inbreeding and genetic diversity parameters were similar between Japanese Shorthorn and other Japanese Wagyu breeds, but the magnitude of the changes was lower in the Japanese Shorthorn.  相似文献