Effects of Rumen Undegradable Protein on Productive Performance and N Balance of Holstein Cows in Early Post-Partum Period
محورهای موضوعی : Camel
1 - Department of Animal Science, Abhar Branch, Islamic Azad University, Abhar, Iran
2 - Department of Animal Science, Abhar Branch, Islamic Azad University, Abhar, Iran
کلید واژه: Performance, fresh cow, nitrogen balance, rumen undegradable protein,
چکیده مقاله :
Metabolizable protein (MP) supply and amino acid balance were manipulated through selection of highly digestible rumen-undegradable protein (RUP) sources. Effects on production efficiency and N utilization of early post-partum dairy cows were determined. Forty-two multiparous and 16 primiparous Holstein cows were assigned to the diets in a randomized complete block design immediately after parturition with 3-wk experimental periods, and then were fed a ration for 120 days in milk. Diets were formulated to provide 3 concentrations of dietary RUP (LRUP 6.65, MRUP 7.72 and HRUP 8.79% of dry matter (DM)) while rumen-degradable protein remained constant (11.3% of DM). Diets contained 26.30% alfalfa hay, 12.60% corn silage, 9.50% sugar beet pulp and 51.5% concentrate in DM basis. Ingredients within the diets were equal across treatments except for fish meal and corn gluten meal that partially replaced with steam rolled barley and soybean meal. Dry matter intake linearly increased by the treatments. Milk yield, Fat corrected milk (FCM) and protein content and yield increased significantly when cows were fed the diets with greater RUP, but milk fat and lactose was not different between treatments. Body weight (BW) changes was improved with intake of high RUP but Body condition score (BCS) changes had significant difference and improved by increasing RUP in the diet. The efficiency of N use increased linearly. Milk urea N and predicted urinary N increased linearly when cows were fed higher amounts of RUP, but differences between the control treatment and high RUP diets were not significant. Fecal N and N balance did not have significant difference. Total tract digestibility of DM and crude protein (CP) intakes increased significantly with greater RUP. In general, increasing amounts of MP and RUP improved productive performance and BCS status of fresh cows and enhanced digestibility of DM and CP.
عرضه پروتئین قابل متابولیسم (MP) و توازن اسیدهایآمینه از راه انتخاب منابع قابل هضم از RUP میتواند مورد دستکاری قرار گیرد. اثرات آن روی بازده تولیدی و مورد استفاده قرار گرفتن نیتروژن گاوهای شیری تازهزا تعیین شد. برای انجام این طرح از تعداد 42 رأس گاو هلشتاین تازهزا چند شکمزا و 16 رأس شکم اول در قالب طرح بلوکهای کامل تصادفی بلافاصله پس از زایش به مدت 3 هفته استفاده شد و سپس همگی یک جیره را تا 120 روز پس از زایش دریافت کردند. از سه تیمار آزمایشی با سه غلظت مختلف RUP (به ترتیب، تیمار اول 65/6 درصد RUP، تیمار دوم 72/7 درصد، و تیمار سوم 79/8 درصد بر اساس مادهخشک) بدون تغییر در RDP (3/11 درصد) استفاده شد. جیرهها حاوی 30/26 درصد یونجه خشک، 60/12 درصد ذرت سیلوشده، 50/9 درصد تفاله چغندر، و 5/51 درصد کنسانتره بر اساس ماده خشک بودند. اجزای جیرهها در بین تیمارها یکسان بودند به جز پودرماهی و کنجاله گلوتن ذرت که در جایگزینی نسبی با دانه جو و کنجاله سویا استفاده شد. ماده خشک مصرفی تفاوت معنیدار نداشت، ولی افزایش عددی داشت. دادههای تولید شیر و تولید شیر تصحیح شده برای درصدهای مختلف چربی نیز تفاوت معنیدار داشتند (05/0>P). ترکیبات شیر به جز پروتئین شیر که تفاوت معنیدار در بین تیمارها داشت (05/0>P)، از لحاظ آماری تفاوتی را نشان ندادند. تجزیه و تحلیل آماری نشان داد که تغییرات امتیاز شرایط بدنی با مصرف جیرههای دارای RUP بالاتر بهبود معنیداری داشت (05/0>P). نیتروژن اورهای شیر تفاوت معنیدار داشت (05/0>P). روند تغییرات نیتروژن پیشبینی شده ادراری همانند نیتروژن اورهای شیر بود. نیتروژنمصرفی نیز در بین تیمارها افزایش معنیدار نشان داد (05/0>P). قابلیتهضم مادهخشک و پروتئینخام افزایش معنیداری داشتند (05/0>P). در تیمار دارای RUP بالاتر نشان دادند. به طور کلی جیره با RUP بالاتر توانست از موبیلیزاسیون بیش از حد بافتهای بدن پیشگیری کند و تولید شیر و تولیدمثل حیوان را به طور معنیداری بهبود بخشد و گلوکز خون که شاخص مهمی در اوایل دوره پس از زایش است را افزایش دهد.
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