مقايسه رشد و خصوصيات لاشه گوسفند لري در شرايط شير پروار، پس از خروج از مرتع و پرواربندي
محورهای موضوعی : فصلنامه زیست شناسی جانوریعلیرضا چگنی 1 * , بهروز یاراحمدی 2 , کریم قربانی 3 , محسن محمدی ساعی 4
1 - بخش تحقیقات علوم دامی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان لرستان، سازمان تحقیقات، آموزش و ترویج کشاورزی، خرم آباد، ایران
2 - بخش تحقیقات علوم دامی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان لرستان، سازمان تحقیقات، آموزش و ترویج کشاورزی، خرم آباد، ایران
3 - بخش تحقیقات علوم دامی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان لرستان، سازمان تحقیقات، آموزش و ترویج کشاورزی، خرم آباد، ایران
4 - بخش تحقیقات علوم دامی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان لرستان، سازمان تحقیقات، آموزش و ترویج کشاورزی، خرم آباد، ایران
کلید واژه: گوسفند لری, لاشه, رشد, شیر پروار, پرواربندی,
چکیده مقاله :
به منظور بررسی رشد و خصوصيات لاشه در شرايط شير پروار، پس از خروج از مرتع و پرواربندي96 رأس گوسفند لري در سنين 5/3، 5/6، 5/9و5/12ماهه طي دو سال مورد مطالعه قرار گرفت. برههاي شير پروار با شير (بعلاوه شبدر بصورت آزاد از يك ماهگي) تغذیه شدند. برههاي گروه دوم از 5/3 تا 5/6 ماهگي از مرتع باضافه خوراک مکمل تعليف شدند. برههاي 5/9 و 5/12 ماهه فقط با تغذيه دستي تعليف شدند. اضافه وزن روزانه در نرها به‌ترتیب 228، 143، 136 و 144گرم در مادهها 192، 127، 103 و 101 گرم بود (01/0p < ). وزن کشتار بين نرها و مادهها و در گروهاي سني مختلف تفاوت معنيداري (01/0p < ) نشان داد. کمترین درصد لاشه در بره‌های 5/6 ماهه نر و ماده و بالاترین آن در سن5/12 ماهه نر مشاهده شد (01/0p < ). بالاترین درصد گوشت لاشه در سن5/9 ماهه ماده درسال دوم به مقدار03/62% بود (01/0p < ). بیشترین درصد استخوان لاشه در 5/6 ماهه ماده به مقدار 83/27 درصد و كمترين در 5/12ماههها بود (01/0p < ). بيشترين درصد چربي لاشه در سن 5/12 ماهه نر در سال اول با 25/30 درصد و كمترين آن در 5/6 ماهه نر با 75/13 درصد بود (01/0p < ). اوزن چربی داخلی لاشه، دنبه، كله، پوست، جگر، قلب، معده و رودههای خالي در دو جنس و در گروههاي سني تفاوت معني داري نشان داد (01/0p < ). همبستگی بالا و مستقیمی بین وزن زنده با اوزان کله، پوست، قلب، جگر، وزن لاشه و دنبه، گوشت، چربی و استخوان لاشه بدست آمد (01/0p < ). بین وزن زنده دام با درصد گوشت و درصد استخوان رابطه منفی وجود داشت (01/0p < ). بهترين سن كشتار برههاي پرواري گوسفند لري در 5/9 ماهگي و در جنس نر بود. ادامه پروار باعث افزايش چربي لاشه گردید. برهها پس از خروج از مرتع اگر بلافاصله كشتار گردند، وزن كشتار، درصد لاشه و گوشت كمتر از حد نهايي ظرفيت واقعي اين نژاد ميباشد.
To investigate growth and carcass characteristics in fattening conditions, 96 Lori sheep at the ages of 3.5, 6.5, 9.5, and 12.5 months were studied over two years after leaving the pasture and being fed. Fattening lambs were fed milk (plus clover ad libitum from one month of age). Lambs in the second group were fed pasture from 3.5 to 6.5 months of age with the addition of supplementary feed. Lambs at 9.5 and 12.5 months of age were fed only by hand feeding. Daily weight gain in males was 228, 143, 136, and 144 grams, and in females 192, 127, 103, and 101 grams, respectively (p < 0.01). Slaughter weight showed a significant difference between males and females and in different age groups (p < 0.01). The lowest carcass percentage was observed in 6.5-month-old male and female lambs, and the highest carcass percentage was observed in 12.5-month-old male lambs (p < 0.01). The highest percentage of carcass meat was 62.03% at the age of 9.5 months in the second year (p < 0.01). The highest percentage of carcass bone was 27.83% in 6.5-month-old females and the lowest was in 12.5-month-old females (p < 0.01). The highest carcass fat percentage was observed in 12.5-month-old males in the first year at 30.25% and the lowest was observed in 6.5-month-old males at 13.75% (p < 0.01). The internal fat weight, tail, head, skin, liver, heart, empty stomach, and intestines of the carcass showed a significant difference in both genders and age groups (p < 0.01). There was a negative correlation between the live weight of the animal and meat percentage and bone percentage (p < 0.01). The best slaughter age of fattening lambs of Lary sheep was 9.5 months and in males. Continuing fattening increased carcass fat. If lambs are slaughtered immediately after leaving the pasture, the slaughter weight, carcass percentage, and meat are less than the ultimate limit of the real capacity of this breed
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