به منظور بررسی اثر افزایش تعداد دوشش بر عملکرد گاوهای تازه زای هلشتاین از 16 راس گاو چند شکم زایش و 4 راس گاو شکم اول که به طور تصادفی بعد از زایمان بین دو تیمار قرار داده شده اند ، به نحوی که تعداد گاوهای شکم اول در دو گروه مساوی بودند . و....

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عضو هیات علمی گروه علوم دامی دانشگاه علوم کشاورزي و منابع طبیعی گرگان

 Abstract

An experiment was conducted to evaluate the different levels of the feed ration of milking cows on milk production and its composition. The research was carried out in Gorgan city vicinity on twelve lactating dairy cows which were similar in no. of calving and other parameters in a randomized complete block design with 4 ration .The fish meal levels consist of 0, 1, 2 and 3 percent Average daily milk yield were 21.30, 22.50, 22.48 and 23.12 kg/day for all the dietsrespectively, which all the diets were greater than control groups (P<0.01).Fat percentage and fat content of milk also were not affected by the diets composition. Body weight gain (g/d) of treatment 4 and 3 were significant over treatment 1 and 2 (P<0.05).Dry matter intake for milk yield (kg/d) in treatment 1 was slightly higher than the other treatments (P<0.05).In the same way fat, protein and lactose percentage of different treatments were almost similar to each other, but no any significant effect were observed

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