Relation of Growth of Crossbred Hair Sheep with some Zoometric Measures
محورهای موضوعی : Camel
1 - Agricultural, Environment and Sustainable Development Research Group (GI@DS), Faculty of Agricultural and Environment Science, Francisco de Paula Santander University, Ocaña, Colombia
کلید واژه: Regression Analysis, animal morphology, body regions,
چکیده مقاله :
The weighing records of 18 crossbred females with average live weight of 14.7 ± 3.14 kg were analyzed to study the relationship of the growth of crossbred hair sheep with some zoometric measures. The weight was established and took the measures thoracic perimeter, cannon perimeter, body length, neck length, hip amplitude, ischial amplitude, withers height and croup height. All parameters were stated as cm. Within 60 days of the initial weighing and taken the zoometric measures, animals were weighed again and the average daily gain was estimated. The correlation coefficients of initial body weight with zoometric measures were high (r>0.7) and the highest of average daily gain were with thoracic perimeter (r=0.41) and body length (r=0.34), to the remaining variables the coefficients were below 0.3.According to Akaike information criterion the best fit model to describe the growth was, average daily gain (ADG) (g/d)= 3.3 × thoracic perimeter (PT) - 44.4 × perimeter cane (PC) + 5.4 × body length (LCO) + 5.6 × amplitude hip (AC) - 3.3 × height at the croup (ALG) (R2=0.92, Akaike information criterion (AIC)=96.8; P<0.05). The zoometric measures relate to the growth, proving to be a tool for information about the growth potential of crossbred lambs.
با هدف مطالعه رابطه بین رشد گوسفندان پشمی آمیخته با برخی از سنجههای حیاتی، رکوردهای توزین 18 ماده آمیخته با میانگین وزن 14/3 ± 7/14 کیلوگرم آنالیز گردیدند. علاوه بر وزن، محیط سینه، محیط ساق، طول بدن، طول گردن، بزرگی استخوان هیپ، بزرگی استخوان ایسشیال، ارتفاع جدوگاه و ارتفاع جناق اندازهگیری شد. همه اندازهگیریها در مقیاس سانتیمتر انجام شد. 60 روز پس از وزنکشی و اندازهگیری سنجههای حیاتی، حیوانات مجدداً توزین شده و میانگین افزایش وزن روزانه آنها برآورد گردید. ضرایب همبستگی وزن بدن اولیه با سنجههای حیاتی بالا بود (7/0<r) و بالاترین میانگین افزایش وزن روزانه در صفت محیط سینه (34/0=r) و طول بدن (34/0=r) مشاهده شده و در سایر متغیرها ضرایب همبستگی زیر 3/0 بودند. بر مبنای معیار اطلاعات آکایک، بهترین مدل برازش یافته برای توصیف رشد عبارت بود از: ارتفاع جناق (ALG) × 3/3 - بزرگی هیپ (AC) × 6/5 + طول بدن (LCO) × 4/5 + محیط ساق (PC) × 4/44 - محیط سینه (PT) × 3/3 = میانگین افزای وزن روزانه بر حسب گرم در روز (ADG) (92/0=R2، 8/96=معیار اطلاعات آکایک (AIC)، 05/0>P). سنجههای حیاتی با رشد در ارتباط بوده و این موضوع نشان میدهد که این سنجهها میتوانند ابزاری برای کسب اطلاع از پتانسیل رشد برههای آمیخته باشند.
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