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首页> 外文期刊>Tropical Animal Health and Production >Impact of crossbreeding Holstein and Brown Swiss cows on milk yield, composition, and fatty acid profiles in subtropics
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Impact of crossbreeding Holstein and Brown Swiss cows on milk yield, composition, and fatty acid profiles in subtropics

机译：杂交荷斯坦和棕色瑞士奶牛对亚热带中牛奶产量，组成和脂肪酸谱的影响

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摘要

Milk yield (MY), composition, and fatty acid profiles of purebred Holstein (HO) cows, Brown Swiss (BS), and their F-1 crossbreds (HS) were compared under subtropical climate in Egypt. Pure HO had significantly greater 305-MY, total-MY, and daily-MY (p & 0.05) than pure BS and crossbred HS. Furthermore, HO and HS had significantly higher peak-MY (44.2 and 43.3 kg, respectively) than BS (36.1 kg). In comparison with HO, BS had significantly higher milk fat, protein, total solids, and solid-not-fat % (p & 0.05); however, no significant differences were observed between BS and HS for milk fat %. The milk fat of BS had higher concentrations of saturated (C17:0 and C18:0) fatty acids (FA) than that of the HO and HS (p = 0.001 and 0.008, respectively). Content of C4:0, C6:0, C8:0, C12:0, and C15.0 FA did not differ between genotypes. Milk from HO and BS had significantly higher concentrations of unsaturated (C20:1 and C20:5) FA than that from HS (p & 0.05). C14:1 (myristoleic), C16:1 (palmitoleic), and C18:2 (linoleic) FA contents were similar for all genotypes. In conclusion, BS surpassed HO for all milk composition traits and some FA components; however, HS had comparable milk fat percentage with BS. There appears to be an opportunity to modify the concentration of certain FA by breeding.
机译：在埃及的亚热带气候下比较了纯种Holstein（HO）奶牛，棕色瑞士（BS）及其F-1杂交（HS）的牛奶产量（我的），组合物和脂肪酸谱。 Pure Ho显着提高了305 - 我的，总体和每日 - 我的（P＆amp; 0.05）比纯BS和杂交HS。此外，HO和HS显着高于BS（44.2和43.3千克）比BS（36.1kg）。与HO，BS相比，BS具有显着更高的牛奶脂肪，蛋白质，总固体和固体 - 非脂肪％（P＆amp; 0.05）;然而，在BS和HS之间没有显着差异，用于牛奶脂肪％。 BS的乳脂具有比HO和HS的脂肪酸（C17：0和C18：0）的饱和（C17：0和C18：0）具有更高的饱和酸（分别为HS（P = 0.001和0.008）。 C4：0，C6：0，C8：0，C12：0和C15.0 FA之间的含量在基因型之间没有区别。来自HO和BS的牛奶比HS（P＆amp; 0.05）的不饱和（C20：1和C20：5）的浓度显着更高。 C14：1（MyRistoleic），C16：1（棕榈药）和C18：2（亚油酸）FA含量与所有基因型相似。总之，BS超过了所有牛奶组合物的特征和一些FA组件;然而，HS与BS具有可比的牛奶脂肪百分比。似乎有机会通过育种来修改某些FA的浓度。

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