The qualities of food, mainly of animal origin, have always been of concern to consumers. It is known that the composition of animals' diets can influence the composition of the foods produced, such as milk. Thus, the objective of this study was to evaluate diets with cactus pear in combination with different forages for F1 Holstein/Zebu cows on the chemical composition and fatty acid profile of milk. Two simultaneous 4 × 4 Latin squares were used in the experimental design. Four experimental diets were used: Diet 1, sorghum silage as the only roughage; Diet 2, sorghum silage combined with cactus pear in a proportion of 50% of the roughage (dry matter basis); Diet 3, elephant grass (Pennisetum purpureum cv. Roxo) as the only roughage; and Diet 4, elephant grass combined with cactus pear in a proportion of 50% of the roughage. The roughage:concentrate ratio was 75:25. The milk urea nitrogen was higher (16.08 mg/dL) in the milk of cows fed the diet with only elephant grass than that of milk from the other diet groups. The other analyzed variables of the chemical composition of milk were not influenced by the diets. However, there was a change in the sum of the saturated and monounsaturated fatty acids. The content of C16:0 fatty acid was higher and that of C18:0 was lower in the milk of cows fed the cactus pear diets than in that of cows fed the other diets. Higher levels of oleic acid were observed in the milk of cows fed with diets containing elephant grass than those in the milk of the cows in the sorghum forage groups. Conjugated linoleic acid (CLA) was higher in the milk of cows fed cactus pear than in that of the other cows. The combination of cactus pear with elephant grass or sorghum silage in the diet did not alter the chemical composition of milk. However, it influenced the fatty acid profile.

中文翻译：

---

仙人掌梨与不同粗饲料来源的组合对F1 Holstein / Zebu奶牛的生产，化学成分和牛奶脂肪酸谱的影响。

食品质量（主要是动物性食品）一直是消费者关注的问题。众所周知，动物饮食的成分会影响所生产的食物（如牛奶）的成分。因此，本研究的目的是评估F1 Holstein / Zebu奶牛配合不同饲草的仙人掌梨日粮的牛奶的化学组成和脂肪酸谱。在实验设计中同时使用了两个4×4的拉丁方格。使用四种实验性饮食：饮食1，高粱青贮饲料为唯一粗饲料；饮食2，高粱青贮饲料与仙人掌梨混合，占粗饲料的50％（以干物质计）；饮食3，以象草（Pennisetum purpureum cv。Roxo）为唯一粗饲料；饮食4，大象草和仙人掌梨的混合比例为粗饲料的50％。毛坯：浓缩比为75:25。在仅用象草喂养的日粮中，牛奶中的尿素氮含量较高（16.08 mg / dL），高于其他饮食组中的牛奶。牛奶化学成分的其他分析变量不受日粮的影响。但是，饱和脂肪酸和单不饱和脂肪酸的总和发生了变化。饲喂仙人掌梨日粮的母牛的牛奶中，C16：0脂肪酸的含量较高，而C18：0脂肪酸的含量则低于其他日粮的母牛。在饲喂含象草的饮食的奶牛中，观察到的油酸含量高于高粱饲草组的奶牛中的油酸含量。饲喂仙人掌梨的奶牛的共轭亚油酸（CLA）高于其他奶牛。饮食中仙人掌梨与象草或高粱青贮饲料的结合不会改变牛奶的化学成分。但是，它影响了脂肪酸谱。