Effects of Fat Supplementation and Chop Length on Milk Composition and Ruminal Fermentation of Cows Fed Diets Containing Alfalfa Silage

محورهای موضوعی : Camel

م. شریفی ¹ , ع. حسین خانی ² , م. صوفی زاده ³ , ج. موسوی ⁴

1 - Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
2 - Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
3 - Department of Animal Science, Faculty of Agriculture, University of Urmia, Urmia, Iran
4 - Department of Animal Science, Faculty of Agricultural Science, University of Gilan, Rasht, Iran

تاریخ دریافت : 1394/04/16 تاریخ پذیرش : 1394/08/24 تاریخ انتشار : 1395/03/12

کلید واژه: dairy cow, milk composition, fat supplementation, ruminal parameters,

چکیده مقاله :

The aim of this study was to evaluate the effect of fat supplementation for enhancing milk conjugated linoleic acid (CLA) in early lactation without affecting ruminal fermentation. 24 Holstein dairy cows were assigned to a completely randomized design employing a 2 × 4 factorial arrangement. Factors were particle size (15 and 25 mm) and two different sources of alfalfa supplemented with and without fat (alfalfa hay; alfalfa hay plus 3% fat; alfalfa silage and alfalfa silage plus 3% fat). The results indicated that fat supplementation had no effect on body condition score, milk yield, feeding behaviour and C18 fatty acids profile of milk. Alfalfa silage with fat increased significantly the amount of C18:1and C18:2 in rumen and milk compared to alfalfa hay with fat. Particle size had no effect on milk yield, C18 fatty acids of milk, ruminal NH3-N and butyrate in the rumen. Dry matter intake, milk fat and acetic acid declined with fat supplementation. Dietary alfalfa silage had significant effect on dry matter intake, milk fat, ruminating time and rumen fermentation. Feeding behaviour decreased with reducing particle size. Results revealed that alfalfa silage with fat increased milk yield enhanced CLA in milk improved blood and ruminal metabolite and maintained higher body weight in Holstein dairy cows.

چکیده انگلیسی:

هدف از این مطالعه بررسی اثر مکمل چربی بر افزایش اسید لینولئیک کانژوگه شیر (CLA) در اوایل شیردهی بدون تأثیر تخمیر شکمبه‪ایی بر آن بود. 24 رأس گاو هلشتاین در یک طرح کاملاً تصادفی با فاکتوریل 2 × 4 مورد استفاده قرار گرفتند. فاکتورها شامل اندازه ذرات (15 و 25 میلیمتر) و دو منبع مختلف یونجه همراه با و بدون چربی (یونجه خشک، یونجه خشک به علاوه 3 درصد چربی، سیلوی یونجه و سیلوی یونجه به علاوه 3 درصد چربی) بود. نتایج نشان داد که مکمل چربی هیچ تأثیری در وضعیت بدنی، عملکرد شیر، رفتارهای غذایی و اسید چرب C18 شیر نداشته است. سیلوی یونجه با چربی سبب افزایش قابل توجهی در مقدار میزان C18:1 و C18:2 در شکمبه و شیر نسبت به یونجه خشک با چربی داشته است. اندازه ذرات علوفه هیچ تأثیری بر تولید شیر، اسیدهای چرب C18 شیر، ازت آمونیاکی و بوتیرات در شکمبه نداشته است. مصرف ماده خشک، چربی شیر و اسید استیک با مکمل چربی کاهش یافته است. سیلوی یونجه اثر قابل توجهی در مصرف ماده خشک، چربی شیر، زمان نشخوار و تخمیر شکمبه داشته است. رفتار تغذیه با کاهش اندازه ذرات کاهش یافته است. نتایج نشان داد که سیلوی یونجه با چربی سبب افزایش تولید شیر، توسعه CLA شیر، بهبود متابولیت‪های خونی و شکمبه‪ایی و حفظ وزن بالاتر بدن در گاوهای شیری هلشتاین می شود

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