Urick J J, Reynolds W L, Knapp B W
USDA-ARS, Fort Keogh Livest. and Range Res. Lab., Miles City, MT.
J Anim Sci. 1991 Nov;69(11):4377-87. doi: 10.2527/1991.69114377x.
Heifer and steer progeny of 2-yr-old first-cross (F1) heifers and 3- to 6-yr-old F1 cows, from Hereford dams and five sire breeds, were evaluated for postweaning feedlot growth and carcass composition. Breeds of sire of dam were Angus (A), Red Poll (RP), Tarentaise (T), Simmental (Sm), and Pinzgauer (P). Calves from 2-yr-old heifers were sired by Shorthorn, and calves from 3- to 6-yr-old dams were sired by Charolais. Breed of sire of dam was significant (P less than .05 to P less than .01) for total gain and final weight for female progeny from 2-yr-old dams. At all weights, Sm, P, and T ranked above A and RP. Progeny of A, P, Sm, and T F1 2-yr-old dams were not significantly different but were higher (P less than .05) than RP heifers in total feedlot gain. Breed of sire of dam was significant (P less than .05) for carcass weight and longissimus muscle area; T ranked highest and RP lowest. Breed was not significant for any growth traits of steer progeny of 2-yr-old dams. Breed was significant for marbling score; A ranked highest and exceeded (P less than .01) both RP and Sm steers. Breed was significant (P less than .05) for most growth traits in the heifer progeny of the 3- to 6-yr-old dams bred to Charolais sires. Heifer calves of the Sm group were heavier (P less than .05) than all other groups for most weights and total gain. For total gain, P and T were intermediate and A and RP lowest. For heifer carcass traits from 3- to 6-yr-old dams, breed was significant (P less than .05 to P less than .01) for carcass weight, longissimus muscle area, percentage of cutability, and estimated kidney, heart, and pelvic fat. Heifers from Sm-sired dams were heavier (P less than .05) than those from all other groups but ranked second to heifers from P for percentage of cutability. Marbling scores of RP heifer carcasses ranked highest of all groups. Breed was not significant (P greater than .05) for any of the weights or gains in steer progeny of 3- to 6-yr-old dams; however, the Sm and P groups ranked above A and RP for all feedlot test weights.(ABSTRACT TRUNCATED AT 250 WORDS)
对来自赫里福德母牛与五个父本品种杂交的2岁初产（F1）小母牛以及3至6岁F1母牛所产的小母牛和阉牛后代，进行了断奶后育肥场生长性能和胴体组成的评估。母本的父本品种分别为安格斯（A）、红白花牛（RP）、塔兰泰拉牛（T）、西门塔尔牛（Sm）和平茨高尔牛（P）。2岁小母牛所产犊牛的父本是短角牛，3至6岁母牛所产犊牛的父本是夏洛来牛。对于2岁母本所产雌性后代的总增重和最终体重，母本的父本品种具有显著影响（P小于0.05至P小于0.01）。在所有体重阶段，西门塔尔牛、平茨高尔牛和塔兰泰拉牛的排名高于安格斯牛和红白花牛。安格斯牛、平茨高尔牛、西门塔尔牛和塔兰泰拉牛F1 2岁母本的后代之间差异不显著，但在育肥场总增重方面高于红白花牛小母牛（P小于0.05）。母本的父本品种对胴体重和背最长肌面积具有显著影响（P小于0.05）；塔兰泰拉牛排名最高，红白花牛最低。对于2岁母本所产阉牛后代的任何生长性状，品种差异均不显著。品种对大理石花纹评分有显著影响；安格斯牛排名最高，超过红白花牛和西门塔尔牛阉牛（P小于0.01）。对于与夏洛来牛父本杂交的3至6岁母本所产小母牛后代的大多数生长性状，品种具有显著影响（P小于0.05）。西门塔尔牛组的小母牛犊在大多数体重和总增重方面比所有其他组更重（P小于0.05）。在总增重方面，平茨高尔牛和塔兰泰拉牛居中，安格斯牛和红白花牛最低。对于3至6岁母本所产小母牛的胴体性状，品种对胴体重、背最长肌面积、可切割比例以及估计的肾、心和骨盆脂肪具有显著影响（P小于0.05至P小于0.01）。西门塔尔牛父本所产小母牛比所有其他组更重（P小于0.05），但在可切割比例方面仅次于平茨高尔牛父本所产小母牛。红白花牛小母牛胴体的大理石花纹评分在所有组中最高。对于3至6岁母本所产阉牛后代的任何体重或增重，品种差异均不显著（P大于0.05）；然而，在所有育肥场测试体重方面，西门塔尔牛和平茨高尔牛组的排名高于安格斯牛和红白花牛组。（摘要截断于250字）
