Dawod Ahmed, Ahmed Hamada, Abou-Elkhair Reham, Elbaz Hamed T, Taha Ayman E, Swelum Ayman A, Alhidary Ibrahim A, Saadeldin Islam M, Al-Ghadi Muath Q, Ba-Awadh Hani A, Hussein Elsayed O S, Al-Sagheer Adham A
Husbandry and Animal Wealth Development Department, Faculty of Veterinary Medicine, University of Sadat City, Menoufia 32897, Egypt.
Nutrition and Vet., Clinical Nutrition Department, Faculty of Veterinary Medicine, Damanhour University, Damanhour 22511, Egypt.
Animals (Basel). 2020 Mar 5;10(3):436. doi: 10.3390/ani10030436.
This study quantifies the effects of extruded linseed and soybean (ELS) dietary supplementation on milk yield, composition, and fatty acid profiles, as well as first-service conception rate in Holstein dairy cows. Seventy-eight open Holstein dairy cows were divided into two groups: (1) a control, which received a basal diet; and (2) a test group, which received a basal diet supplemented with the ELS (650 g/kg of extruded linseed and 150 g/kg of extruded soybean) at a rate of 100 g/kg. In the ELS group, milk yield per day and solid not fat (SNF) yield increased by 3.26% and 0.88%, respectively, in relation to the control. Percentage milk fat decreased significantly by 1.4% in the ELS group when compared with the control. The ELS supplement resulted in a decrease in saturated fatty acids (SFAs) and an increase in monounsaturated (MUFAs) and polyunsaturated fatty acids (PUFAs) in milk. In conclusion, the supplementation of dairy cow feed with 100 g/kg of ELS increases milk yield and milk unsaturated fatty acids (especially MUFAs and PUFAs). ELS supplementation also causes a decrease in percentage fat and SFA levels but does not affect the first-service conception rate or the incidence rate of mastitis.
本研究量化了挤压亚麻籽和大豆（ELS）日粮添加物对荷斯坦奶牛产奶量、奶成分、脂肪酸谱以及首次配种受胎率的影响。78头空怀荷斯坦奶牛被分为两组：（1）对照组，饲喂基础日粮；（2）试验组，饲喂添加了ELS（650克/千克挤压亚麻籽和150克/千克挤压大豆）的基础日粮，添加比例为100克/千克。在ELS组中，与对照组相比，日产奶量和非脂固形物（SNF）产量分别提高了3.26%和0.88%。与对照组相比，ELS组的乳脂百分比显著降低了1.4%。ELS添加物使牛奶中的饱和脂肪酸（SFA）减少，单不饱和脂肪酸（MUFA）和多不饱和脂肪酸（PUFA）增加。总之，在奶牛饲料中添加100克/千克的ELS可提高产奶量和牛奶不饱和脂肪酸（尤其是MUFA和PUFA）含量。添加ELS还会使乳脂百分比和SFA水平降低，但不影响首次配种受胎率或乳腺炎发病率。
