تأثیر تغذیه آمینو اسیدهای محافظت شده، پیش و پس از زایش بر عملکرد و پویایی پروتئینی گاوهای تازه زا

نوع مقاله : مقاله پژوهشی

نویسندگان
علیرضا میرزاخانی 1
نصرالله پیرانی 1
علی محرری 1
محمدجواد ضمیری 2
حسین مهربان 3
1 گروه علوم دامی دانشکده کشاورزی، دانشگاه شهرکرد
2 گروه علوم دامی دانشکده کشاورزی، دانشگاه شیراز
3 سازمان تحقیقات کشاورزی کرج
چکیده
شروع شیردهی شامل تغییرات هماهنگ در چندین بافت است، از جمله بسیج پروتئینی ماهیچه ها که برای تامین نیازهای گاو به آمینو اسیدها صورت می گیرد. پژوهش حاضر جهت بررسی اثر آمینو اسید های محافظت شده لیزین و متیونین به جیره پیش و پس از زایش بر عملکرد و پویایی پروتئین در دوره پس از زایش انجام شد. بیست و یک راس گاو هلشتاین (7 تکرار در هر تیمار) از 28 روز پیش از زایش تا 28 روز پس از زایش به طور تصادفی به سه جیره اختصاص یافتند. تیمارهای آزمایشی عبارت بودند از : جیره شاهد، جیره آمینو اسید؛ متوازن شده برای آمینو اسیدهای متیونین و لیزین محافظت شده در سطح جدیدترین توصیه ها و جیره پر پروتئین متوازن شده برای متیونین و لیزین فوق با استفاده از کنجاله سویا، کنجاله کلزا و کنجاله گلوتن ذرت. همسو با نتایج، ماده خشک مصرفی، وزن بدن و ضخامت بافت ماهیچه و چربی در تیمارهای آمینواسید و پر پروتئین نسبت به گروه شاهد بالاتر بود (05/0>P). شاخص تجزیه بافت ماهیچه، 3- متیل هیستیدین شیر، در تیمار شاهد نسبت به تیمار آمینو اسید و پرپروتئین بالاتر بود (01/0> P) اما 3- متیل هیستیدین در گاوهای تیمار آمینواسید در مقایسه با پرپروتئین کم تر بود (01/0> P). در کل به نظر می رسد افزودن آمینو اسیدهای محدود کننده لیزین و متیونین به جیره گاوهای دوره انتقال نه تنها منجر به بهبود خوراک مصرفی و عملکرد تولیدی می شود بلکه در پیش گیری از تجزیه بیش از حد بافت پروتئین و چربی طی دوره پس ار زایش موثر است.

کلیدواژه‌ها
لیزین
متیونین
گاو تازه زا
3- متیل هیستیدین

عنوان مقاله English

The effect of feeding protected amino acids pre- and post-partum, on performance and dynamics protein of fresh cows

نویسندگان English

Alireza Mirzakhani 1
Nasrollah Pirani 1
Ali Moharreri 1
Mohammad Javad Zameri 2
Hossein Mehrban 3
1 Ph. D Student of Animal Nutrition, Department of Animal Sciences, Faculty of Agriculture, Shahrekord University, Shahrekord- Iran.
2 Department of Animal Sciences, Faculty of Agriculture, Shiraz University, Shiraz- Iran.
3 Division of Genetics and Animal Breeding, Animal Science Research Institute of Iran, Agriculture Research, Education, and Extension Organization (AREEO), Karaj- Iran.
چکیده English

Lactation initiation involves coordinated changes in several tissues, including muscle protein mobilization to meet the cow's amino acid requirements. The present study was conducted to investigate the effect of the protected amino acids lysine and methionine in pre- and post-partum diets on protein performance and dynamics in the post-partum period. Twenty-one Holstein cows (7 replicates per treatment) were randomly assigned to three diets from 28 days before calving to 28 days after calving. The experimental treatments were a control diet, an amino acid diet balanced for the amino acids methionine and lysine protected at the level of the latest recommendations, and a high protein diet balanced for the above methionine and lysine using soybean meal, canola meal and corn gluten meal. Consistent with the results, dry matter consumption, body weight, and thickness of muscle and fat tissue were higher in the amino acid and high protein treatments compared to the control group (P<0.05). The muscle tissue breakdown index, 3-methylhistidine of milk, was higher in the control treatment compared to amino acid and proprotein treatment (P<0.01), but 3-methylhistidine was lower in amino acid treatment cows compared to proprotein treatment (P<0.01). In general, it seems that the addition of limiting amino acids lysine and methionine to the diet of cows during the transition period not only leads to the improvement of feed consumption and production performance but also is effective in preventing the excessive breakdown of protein and fat tissue during the postpartum period.

کلیدواژه‌ها English

Methionine
Fresh Cow
3-Methylhistidine
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علوم درمانگاهی دامپزشکی ایران
دوره 18، شماره 1 - شماره پیاپی 30
بهار و تابستان 1403
مرداد 1403
صفحه 75-86