اثر سطوح مختلف پنبه‌دانه کامل بر تولید، ترکیبات شیر، قابلیت هضم و فراسنجه‌های خونی در گاو شیری نژاد مونت بیلیارد

نوع مقاله : علمی پژوهشی - تغذیه نشخوارکنندگان

نویسندگان

1 دانشگاه علوم کشاورزی و منابع طبیعی گرگان

2 علوم کشاورزی و منابع طبیعی گرگان

چکیده

این آزمایش به منظور بررسی اثرات سطوح مختلف پنبه‌دانه بر عملکرد، ترکیب شیر، قابلیت هضم ماده خشک و فراسنجه‌های خونی گاوهای شیری نژاد مونت بیلیارد در اوایل دوره شیر‌دهی انجام شد. بدین منظور از 16رأس گاو شیری مونت بیلیارد در 4 تیمار با 4 تکرار، در قالب طرح کاملاً تصادفی استفاده شد. تیمار‌های آزمایشی شامل تیمار شاهد (صفر درصد پنبه‌دانه) و سه سطح مختلف پنبه‌دانه شامل 7، 14 و 21 درصد در جیره بود. همه جیره‌های کاملاً مخلوط به صورت انفرادی تا حد اشتها (به طور آزاد) به دام‌ها داده شده و گاوها 2 بار در روز دوشیده شدند. نمونه‌گیری از شیر به طور هفتگی انجام شد. به منظور اندازه‌گیری فراسنجه‌های خونی (گلوکز، کلسترول، تری‌گلیسرید، نیتروژن اوره‌ای)، خونگیری از سیاهرگ دمی گاوها انجام گرفت. تولید شیر خام بر اساس ضریب 4 درصد چربی شیر تصحیح شده و ترکیبات شیر و قابلیت هضم ماده خشک خوراک بررسی شد. تولید شیر خام در جیره‌های حاوی پنبه‌دانه نسبت به جیره بدون پنبه‌دانه (شاهد) به طور معنی‌داری افزایش یافت. در میان جیره‌های حاوی پنبه‌دانه، با افزایش درصد پنبه‌دانه در جیره درصد چربی شیر گاوها به طور معنی‌داری افزایش یافت. ماده خشک مصرفی و قابلیت هضم ماده خشک جیره درگاوهای تغذیه شده با جیره‌های1 تا 4 تفاوت معنی‌داری را نشان داد. با افزایش مقدار پنبه‌دانه در جیره شاهد مقدار گلوکز کاهش و میزان کلسترول، تری‌گلیسرید و نیتروژن اوره‌ای خون به طور معنی‌داری افزایش یافت. نتایج تحقیق حاضر نشان داد افزودن پنبه‌دانه کامل به جیره غذایی به میزان 14 و 21 درصد می‌تواند تولید شیر، درصد چربی شیر و درصد مواد کل جامد شیر را افزایش دهد.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Different Levels of Whole Cottonseed on Production, Milk Composition, Digestibility and Blood Parameters of Montebeliard Breed Lactating Cows

نویسندگان [English]

  • mahboobeh shahi 1
  • taghi ghoorchi 2
1 Gorgan University of Agricultural Sciences and Natural Resources
2 Gorgan University of Agricultural Sciences and Natural Resources
چکیده [English]

Introduction This experiment was conducted to investigate the effects of different level of whole cotton seed on performance, milk composition, dry matter digestibility and blood parameters of Montebeliard cows at first milking period. Whole cottonseed (WCS) is an unusual feedstuff for ruminants. Due to its high content of fat and protein, it may be defined as a concentrate. On the other hand, its fiber is similar to that of forages in terms of effectiveness in the rumen. The response of dairy cattle milk production to WCS feeding is variable. A large part of the effect of WCS on milk production is related to ruminal effects, which depend upon the basal diet fermentation balance. Montbéliarde cattle are a red and white pied cattle breed from the Montbéliard region of France, used mainly for dairying and particularly for cheese making.
Materials and Methods This research project was conducted at Behkadeh Razavi Corporation, Bojnourd, North province and department Animal Science Gorgan University of Agricultural Sciences and Natural Resources, Iran. In this experiment 16 Montebeliard dairy cows were used in a completely random design with 4 treatments and 4 cows per each treatment during 30 days (14 day adaptation and 16 day sampling). Each treatment received whole cottonseed according their group (0 % (control), 7, 14 and 21% respectively). Cows were milking 2 times in each day and sampling of milk was done weekly. The average milk production and body weight cows before experiment were 24.8±3kg day-1 and 840±30kg. Samples were collected from tail vein for blood parameters (glucose, cholesterol, TG and BUN) in last day. Milk production corrected with 4% fat coefficient. The 3 days end experiment collection of samples of feces used for apparent digestibility of dry matter. The AIA content of the feed and the excreta were determined
Results and Discussion Over the experimental periods, production of raw milk in the diets with whole cotton seed were greater significantly than control group (P

کلیدواژه‌ها [English]

  • Blood parameters
  • digestibility
  • Milk Composition
  • Milk production
  • Montebeliarde
  • Whole cottonseed
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