Productive and Reproductive Potentialities of Different Genetic Groups of Crossbred Cows Reared under Different Farming Conditions
محورهای موضوعی : Camelجی. میاه 1 , م.اس.اچ. سهل 2 , م.آی. حسین 3 , م. شهجلال 4 , م.اس. حسین 5 , م.آ. حسین 6 , ک.ن. اسلام 7
1 - Department of Genetics and Animal Breeding, Chittagong Veterinary and Animal Science University, Chittagong, Bangladesh
2 - Department of Anatomy and Histology, Chittagong Veterinary and Animal Science University, Chittagong, Bangladesh
3 - Department of Genetics and Animal Breeding, Chittagong Veterinary and Animal Science University, Chittagong, Bangladesh
4 - Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Science University, Chittagong, Bangladesh
5 - Department of Medicine and Surgery, Chittagong Veterinary and Animal Science University, Chittagong, Bangladesh
6 - Department of Dairy and Poultry Science, Chittagong Veterinary and Animal Science University, Chittagong, Bangladesh
7 - Department of Anatomy and Histology, Chittagong Veterinary and Animal Science University, Chittagong, Bangladesh
کلید واژه: crossbred, genetic groups, productive and reproductive performance,
چکیده مقاله :
A cross-sectional comparative study was carried out to investigate the productive and reproductive performances of different genetic groups of crossbred cows at three different farming conditions in Bangladesh. Crossbred cows (n=90) those already completed third lactations, were selected randomly from three different dairy farms (e.g. Jarip, Mullah and Nahar) located in Chittagong, Bangladesh. The numbers of animals of each of the genetic groups were 30 for 50% Holstein Friesian (HF) × 50% Sahiwal (SL) cross, 30 for 62.5% HF × 37.5% SL cross and 30 for 75% HF × 25% SL cross. Different productive and reproductive traits of crossbred cows such as age at first heat, calving interval, gestation length, service per conception, days open, lactation length and milk yield, etc., were measured in this study. Results demonstrated that gestation length of 50% HF × 50% SL, lactation length of 62.5% HF × 37.5% SL, gestation and lactation length of 75% HF × 25% SL crossbred cows between the farms were significantly influenced (P<0.05). Other parameters of crossbred cows such as age at first heat, age at first calving, service per conception, average daily milk yield, days open and calving interval of different genotypes were not influenced (P>0.05) by different farms. The highest (282.00±0.00 days) and lowest (276.43±0.92 days) gestation length were found in crossbred cows of the Jarip and Nahar dairy farm, respectively. The highest (297.50±3.50 days) and lowest (282.00±0.00 days) gestation length were found in crossbred cows of Mullah and the Jarip dairy farm, respectively. The overall productive and reproductive performance of different crossbred cows of the Nahar and Mulla dairy farm were superior to that of the Jarip dairy farm.
یک مطالعه مقایسهای برای بررسی عملکردهای تولیدی و تولیدمثلی گروههای ژنتیکی مختلف گاوهای آمیخته در سه شرایط پرورشی مختلف در بنگلادش انجام شد. گاوهای آمیختهای که دوره سوم شیردهیشان را کامل کرده بودند (90=n)، به طور تصادفی از سه مزرعه مختلف (جریپ، ملاه و ناهر) در چیتاگونگ بنگلادش انتخاب شدند. تعداد حیوانات هر گروه ژنتیکی عبارت بودند از: 30 رأس آمیختههای 50 درصد هلشتاین فریزین (HF) × 50 درصد ساهیوال (SL)، 30 رأس آمیختههای 5/62 درصد HF × 5/37 درصد SL و 30 رأس آمیختههای 75 درصد HF × 25 درصد SL. صفات تولیدی و تولیدمثلی مختلف گاوهای آمیخته نظیر سن نخستین فحلی، فاصله زایش، طول آبستنی، تعداد سرویس به ازای هر آبستنی، روزهای باز، طول دوره شیردهی، تولید شیر و غیره در این مطالعه اندازهگیری شدند. نتایج نشان داد که طول آبستنی در آمیختههای 50 درصد HF × 50 درصد SL، طول دوره شیردهی در آمیختههای 5/62 درصد HF × 5/37 درصد SL، طول دوره آبستنی و طول دوره شیردهی در آمیختههای 75 درصد HF × 25 درصد SL بین مزارع مختلف به نحو معنیداری (05/0>P) تحت تأثیر قرار گرفتند. سایر پارامترهای گاوهای آمیخته نظیر سن نخستین فحلی، سن نخستین زایش، تعداد سرویس به ازای هر آبستنی، میانگین تولید شیر روزانه، تعداد روزهای باز و فاصله زایش ژنوتیپهای مختلف تحت تأثیر مزارع قرار نگرفتند (05/0<P). بالاترین (00/0±00/282 روز) و پایینترین (92/0±43/276 روز) طول آبستنی به ترتیب در گاوهای آمیخته مزارع جریپ و ناهر دیده شد. بالاترین (50/3±50/297 روز) و پایینترین (00/0±00/282 روز) طول آبستنی به ترتیب در گاوهای آمیخته مزارع ملاه و جریپ دیده شد. به طور کلی عملکرد تولیدی و تولیدمثلی گاوهای آمیخته مختلف مزارع ناهر و ملاه بالاتر از مزرعه جریپ بود.
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