Gregory K E, Cundiff L V, Koch R M
Roman L. Hruska U.S. Meat Animal Research Center, USDA, Clay Center, NE 68933-0166.
J Anim Sci. 1992 Aug;70(8):2366-72. doi: 10.2527/1992.7082366x.
Retained heterosis in F2 cows nursing F3 progeny was evaluated in 3-, 4-, and greater than or equal to 5-yr-old cows. Traits evaluated included milk yield at three stages of lactation and 200-d weight of progeny. Breed effects were evaluated in the nine parental breeds (Red Poll [R], Hereford [H], Angus [A], Limousin [L], Braunvieh [B], Pinzgauer [P], Gelbvieh [G], Simmental [S], and Charolais [C]) that contributed to the three composite populations (MARC I = 1/4 B, 1/4 C, 1/4 L, 1/8 H, 1/8 A; MARC II = 1/4 G, 1/4 S, 1/4 H, 1/4 A; and MARC III = 1/4 R, 1/4 P, 1/4 H, 1/4 A). Breed effects were significant for 12-h milk yield, estimated 200-d milk yield, and 200-d weight of progeny. Herefords were lowest (P less than .05) for 12-h milk yield and estimated 200-d milk yield, and Braunvieh produced significantly more milk than all breed groups except Pinzgauer and Simmental, for which the difference approached significance. The correlation among breed group means (nine parental breeds and three composites) for 12-h milk yield with 200-d weight of progeny was .91. When 200-d weight was adjusted to a common estimated 200-d milk yield, Hereford, Angus, Red Poll, and Limousin did not differ (P greater than .05); all were significantly lighter than Braunvieh, Pinzgauer, Gelbvieh, Simmental, and Charolais, which did not differ (P greater than .05) from each other.(ABSTRACT TRUNCATED AT 250 WORDS)
对哺乳F3后代的F2代母牛的杂种优势保留情况进行了评估，涉及3岁、4岁以及大于或等于5岁的母牛。评估的性状包括泌乳三个阶段的产奶量以及后代的200日龄体重。在构成三个复合群体（MARC I = 1/4 西门塔尔牛、1/4 夏洛莱牛、1/4 利木赞牛、1/8 赫里福德牛、1/8 安格斯牛；MARC II = 1/4 吉尔维牛、1/4 西门塔尔牛、1/4 赫里福德牛、1/4 安格斯牛；MARC III = 1/4 红白花牛、1/4 平茨高尔牛、1/4 赫里福德牛、1/4 安格斯牛）的九个亲本品种（红白花牛[R]、赫里福德牛[H]、安格斯牛[A]、利木赞牛[L]、西门塔尔牛[B]、平茨高尔牛[P]、吉尔维牛[G]、西门塔尔牛[S]和夏洛莱牛[C]）中评估品种效应。品种效应在12小时产奶量、估计的200日产奶量以及后代的200日龄体重方面具有显著性。赫里福德牛的12小时产奶量和估计的200日产奶量最低（P < 0.05），西门塔尔牛的产奶量显著高于除平茨高尔牛和西门塔尔牛之外的所有品种组，与这两个品种组的差异接近显著水平。12小时产奶量的品种组均值（九个亲本品种和三个复合群体）与后代200日龄体重之间的相关性为0.91。当将200日龄体重调整为共同的估计200日产奶量时，赫里福德牛、安格斯牛、红白花牛和利木赞牛之间没有差异（P > 0.05）；它们均显著轻于西门塔尔牛、平茨高尔牛、吉尔维牛、西门塔尔牛和夏洛莱牛，而后五个品种之间没有差异（P > 0.05）。（摘要截断于250字）
