Influence of Body Condition Score on Yield and Composition of Milk in Crossbred Dairy Cows

محورهای موضوعی : Camel

م.ای. حسین ¹ (Department of Animal Science and Nutrition, Faculty of Veterinary Medicine, Chittagong Veterinary and Animal Science University, Khulshi, Chittagong, Bangladesh)
تی. چندا ² (Department of Dairy and Poultry Science, Faculty of Animal Science and Veterinary Medicine, Patuakhali Science and Technology University, Patuakhali, Bangladesh)
جی.کا. دبناث ³ (Department of Dairy and Poultry Science, Faculty of Veterinary Medicine, Chittagong Veterinary and Animal Science University, Khulshi, Chittagong, Bangladesh)
م.م. حسن ⁴ (Department of Physiology, Pharmacology and Biochemistry, Faculty of Veterinary Medicine, Chittagong Veterinary and Animal Science University, Khulshi, Chittagong, Bangladesh)
آ.اچ. شایکات ⁵ (Department of Physiology, Pharmacology and Biochemistry, Faculty of Veterinary Medicine, Chittagong Veterinary and Animal Science University, Khulshi, Chittagong, Bangladesh)
م.آ. هکو ⁶ (Department of Physiology, Pharmacology and Biochemistry, Faculty of Veterinary Medicine, Chittagong Veterinary and Animal Science University, Khulshi, Chittagong, Bangladesh)

تاریخ دریافت : 1392/07/05 تاریخ پذیرش : 1392/08/25 تاریخ انتشار : 1394/03/11

کلید واژه: body condition score, crossbred dairy cow, milk composition, milk yield,

چکیده مقاله :

The study was carried out for a period of 150 days on 120 Holstein Friesian crossbred dairy cows between mid to late lactation to quantify the influence of body condition score (BCS) on yield and composition of milk. Total 12 dairy farms having same housing systems and holding at least 20 crossbred dairy cows per farm between mid to late lactation were selected for this study purposes. BCS of individual cows was recorded in a 1-5 scale. Milk samples were collected from individual cow. Samples collected from cows having same BCS were mixed together to make composite sample. Chemical analyses of the samples were carried out in triplicate for fat, protein, lactose, ash, total solids (TS) and solids not fat (SNF). Results indicated that, BCS significantly (P<0.05) affected milk yield, milk fat and ash content in crossbred Holstein Friesian dairy cows. Highest milk yield (13.45±1.80 kg/day) was recorded with moderate BCS (3.00) followed by lower (2.75 to 2.25) and higher (3.25 to 4.00). Milk protein, lactose, TS, SNF and specific gravity (SG) increased non significantly (P>0.05) with increasing BCS up to 4.0. Correlation coefficient matrix indicated that BCS was negatively correlated with milk yield. However, there was a positive relationship of BCS with milk protein, lactose, TS, SNF and SG even though the strength of association was variable.

چکیده انگلیسی:

این مطالعه بر روی 120 گاو شیری آمیخته هلشتاین فریزین در طی یک دوره 150 روزه در میانه دوره شیردهی صورت گرفت و هدف از اجرای آن کمی­سازی تأثیر نمره شرایط بدنی (BCS) بر تولید و ترکیب شیر بود. از 12 مزرعه پرورش گاو شیری با شرایط پرورشی یکسان استفاده شد. در هر یک از این دو مزرعه حداقل 20 گاو شیری آمیخته که در میانه دوره شیردهی بودند، در این مطالعه استفاده شد. تأثیر نمره شرایط بدنی انفرادی گاوها در مقیاس 1 تا 5 رکورد برداری گردید. از هر گاو به صورت انفرادی نمونه شیر گرفته شد. نمونه­های جمع­آوری شده از گاوهای با BCS مشابه با یکدیگر مخلوط شدند تا نمونه مرکب به دست آید. آنالیزهای شیمیایی نمونه­ها برای چربی، پروتئین، لاکتوز، خاکستر، ماده خشک کُل (TS) و ماده خشک غیر چربی (SNF) سه بار صورت گرفت. نتایج نشان داد که BCS تأثیر معنی ­داری بر تولید شیر، چربی شیر و خاکستر شیر در گاوهای شیری آمیخته هلشتاین فریزین دارد (05/0>P). بالاترین تولید شیر (80/1±45/13) در تأثیر نمره شرایط بدنی‌های متوسط (0/3) رکورد برداری شده و پس از آن مقادیر کمتر (75/2 تا 25/2) و بیشتر (25/3 تا 00/4) قرار می­گرفتند. افزایش پروتئین، لاکتوز، TS، SNF و گرانروی مخصوص (SG) همگام با با افزایش BCS تا 4 معنی ­داری نبوده است (05/0<P). ماتریس ضرایب همبستگی نشان داد که BCS با تولید شیر همبستگی منفی دارد. ولی همبستگی بین BCS و پروتئین، لاکتوز، TS، SNF و SG شیر مثبت بوده ولی شدت این رابطه متغیر بوده است.

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