Growth Performance and Feed Conversion Efficiency of Crossbred Heifers
محورهای موضوعی : Camelن.ک.د. نس 1 , م.آ. باست 2 , ن. زاهان شوشه 3 , اس.آ. بلال 4 , م. آکتاروزمان 5 , م.ن. اودین 6
1 - Department of Livestock Production and Management, Sylhet Agricultural University, Sylhet, Bangladesh
2 - Department of Livestock Production and Management, Sylhet Agricultural University, Sylhet, Bangladesh
3 - Department of Livestock Production and Management, Sylhet Agricultural University, Sylhet, Bangladesh
4 - Department of Poultry Science, Sylhet Agricultural University, Sylhet, Bangladesh|Department of Animal Biotechnology, Chonbuk National University, Jeonju, Korea
5 - Department of Pharmacology and Toxicology, Sylhet Agricultural University, Sylhet, Bangladesh
6 - Department of Livestock Production and Management, Sylhet Agricultural University, Sylhet, Bangladesh| Department of Animal Science, Chonbuk National University, Jeonju, Korea
کلید واژه: growth performance, feed conversion, feed, heifers,
چکیده مقاله :
Theexperiment was conducted to investigate the growth performance and feed conversion efficiency of crossbred heifer at different age level in Government Dairy Farm in Bogra, Bangladesh. Twelve female crossbred heifers were equally distributed (n=3) into four groups [Group A: (7±2 months), B: (12±2 months), C: (15±2 months) and D: (20±2 months)] according to age and fed concentrate mix, rice straw and Napier grass at the rate of 2% of live weight. Napier grass and rice straw were offered at the ratio of 1:1. The concentrate mixture was provided at the rate of 1% of their body weight. It was found that dry matter content was higher in concentrate mix and rice straw and lower in Napier grass. Organic matter content was higher in Napier grass than that of concentrate and rice straw. Crude fiber concentration was higher in rice straw than that of concentrate and Napier grass. Intake of dry matter and organic matter differed significantly among the treatment groups. Crude protein intake was higher in C group heifer than other groups. Intake of crude fiber was higher in C group followed by B, D and A group. The final live weight was higher in D group than C, B and A group. Unit feed dry matter intake was higher with the advancement of age, being lowest in younger group. The heifers of D group showed higher value of feed conversion efficiency followed by C, B and A group respectively and concluded 20 ± 2 months of heifer is more economical than the other ages.
این آزمایش برای بررسی عملکرد رشدی و راندمان تبدیل خوراک تلیسه های آمیخته در سنین مختلف در یک مزرعه گاو شیری دولتی در بوگرا بنگلادش انجام شد. دوازده رأس تلیسه آمیخته در چهار گروه مطابق سن (گروه A؛ 2±7 ماه، گروه B؛ 2±12 ماه، گروه C؛ 2±15 ماه؛ گروه D؛ 2±20 ماه) توزیع و از مخلوط خوراک کنسانتره، کاه برنج و علوفه فیل در سطح 2 درصد از وزن بدن تغذیه شدند. علوفه فیل و کاه برنج در نسبت 1 به 1 عرضه شدند. مخلوط کنسانتره در سطح 1 درصد از وزن بدن در اختیار تلیسه ها قرار گرفت. نتیجه اینکه، محتوای ماده خشک در مخلوط کنسانتره و کاه برنج بالاتر و در علوفه فیل پایینتر بود. محتوای ماده آلی در علوفه فیل در مقایسه با کنسانتره و کاه برنج بالاتر بود. غلظت الیاف خام در کاه برنج در مقایسه با مخلوط کنسانتره و علوفه فیل بالاتر بود. مصرف ماده خشک و ماده آلی به طور معنیداری در میان گروههای تیماری متفاوت بود. مصرف پروتیین خام در گروه C بالاتر بود و توسط گروههای B، D و A دنبال میشد. وزن نهایی بدن در گروه D بالاتر از گروه های C، B و A بود. واحد مصرف ماده خشک با افزایش سن افزایش یافت و در گروههای جوان پایینترین مقدار را داشت. تلیسه های گروه D مقادیر بالاتری از راندمان تبدیل خوراک را نشان دادند که توسط گروه های C، B و A دنبال می شد. تلیسه های 2±20 ماه سن نسبت به سایر سنین اقتصادی تر بودند.
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