Milk Traits and Their Relationship with Udder Measurements in Awassi Ewes

محورهای موضوعی : Camel

K.Y. Merkhan ¹

1 - Department of Animal Production, Faculty of Agriculture and Forestry, University of Duhok, Kurdistan Region, Iraq

تاریخ دریافت : 1392/05/04 تاریخ پذیرش : 1392/08/08 تاریخ انتشار : 1393/06/10

کلید واژه: Awassi ewe, milk trait, udder measurement,

چکیده مقاله :

Characteristic of the udder, milk traits and their relationship were investigated in 32 Awassi ewes raised in a commercial flock. Commencing one month after lambing milk yield was recorded at monthly intervals until the ewes were dried. Also, the udder traits were measured, including udder width, udder circumference, udder length, distance between teats and length and diameter of both teats. Results revealed that sex of lambs and stage of lactation affected (P<0.05) test day milk yield. The age of dam had no effect on test day milk yield, but affected (P<0.05) left teat diameter and right teat length. Also, sex of lambs affected (P<0.05) right teat length. As the milk yield increased there was an increase in udder circumference and teat diameter (P<0.05). Milk yield positively correlated with all udder measurements except with udder length and right teat length. Also, positive and high correlation coefficients were observed between udder circumference and udder width (r=0.679), distance between teat (r=0.699) and left teat diameter (r=0.417) as well as between udder width and distance between teats (r=0.732). A positive relationship (P<0.01) among teat measurements (r=0.596-0.908) was observed. According to the results of principal component analysis, udder circumference and right teat length were the best predictors for milk yield in Awassi ewes.

چکیده انگلیسی:

خصویات پستان، صفات تولید شیر و ارتباط آنها در 32 میش آواسی که در یک گله تجاری پروش داده می‌شدند، مورد بررسی قرار گرفت. تولید شیر ماهانه از یک ماه پس از زایش تا آغاز دوره خشکی ثبت گردید. همچنین صفات پستان شامل عرض پستان، محیط پستان، طول پستان، فاصله بین سرپستانک‌ها و طول و قطر هر کدام از سرپستانک‌ها نیز اندازه‌گیری گردیدند. نتایج نشان داد که جنسیت بره‌ها و مرحله شیردهی بر تولید شیر روزآزمون میش‌ها تأثیر می‌گذارد (05/0>P). سن میش تأثیری بر تولید شیر روز آزمون نداشته (05/0>P) ولی بر قطر سرپستانک چپ و طول سرپستانک راست تأثیر می‌گذارد. همچنین، جنسیت بره‌ها بر طول سرپستانک راست مؤثر است (05/0>P). همگام با افزایش تولید شیر، محیط پستان و قطر سرپستانک نیز افزایش می‌یابد (05/0>P). تولید شیر با همه سنجه‌های پستان به غیر از طول پستان و طول سرپستانک راست همبستگی مثبت دارد. همچنین همبستگی بین محیط پستان و عرض پستان (679/0=r)، فاصله بین سرپستانک‌ها (699/0=r) و قطر سرپستانک چپ (417/0=r) و همبستگی بین عرض پستان و فاصله بین سرپستانک‌ها (732/0=r)، مثبت و بالا بوده است. همبستگی بین سنجه‌های سرپستانک (596/0=r تا 908/0=r) نیز مثبت می‌باشد (01/0>P). برمبنای آنالیز مؤلفه‌های اصلی، محیط پستان و طول سرپستانک راست، بهترین پیش‌بینی کننده برای تولید شیر در میش‌های آواسی هستند.

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