LIVE WEIGHT AND GAIN AT SHEEP FROM ILL-DE-FRANCE BREED ACCORDING TO SOME FACTORS

Emilia Raicheva, Tania Ivanova

Abstract: The aim was research, analyze and estimation of the live weight and the gain at sheep from Ill-de-France breed according to some factors. The study was carried out during 2009 with 176 ewes from different age (1.5-6), 41 female and 41 male lambs with different type of birth (single, twins and triple) from Ill-de-France breed in IAS - Kostinbrod. Live weights were measured at ewes. It was recorded the type of lamb birth and live weight. The average daily gain was calculated between 10-30 days and 30-70 days. The obtained information was calculated by EXCEL, 2003.The effects of the investigated factors were established by least square methods (ANOVA). It was established the high significant effect of the ewes age (P<0.001) on the live weight variation. The lowest live weight had the yearlings (61.3 kg), but the highest - ewes at the 5 (80 kg) and 6 (81.17 kg) years old (P<0.001). The type of birth significantly estimated the variation of live weight at the birth, at 10, 30 and 70 days and gain between 30-70 days of the female and male lambs (P<0.001, P<0.01, P<0.05). The female and male single lambs at the all studied age significantly exceeded the twins and triple (P<0.001, P<0.01, P<0.05). It was established significantly differences in live weight of male twins and triple on the
studied age (P<0.001, P<0.01, P<0.05).

Keywords: age; average daily gain; Ill-de-France breed; live weight; sheep; type of birth

Date published: 2023-02-20