A Research on The Effects of Body Weight at 18th Weeks of Age and Flock Uniformity in Layer Pullets on Some Performance Criteria in Laying Period

Authors : Ali ÇOLAK, Ramazan YETİŞİR

Pages : 9-20

View : 41 | Download : 17

Publication Date : 2010-09-25

Article Type : Research Paper

Abstract :This research was carried out to determine the statistical relations insert ignore into journalissuearticles values(r, b); between live weight insert ignore into journalissuearticles values(LW); and flock uniformity at the18th weeks of age with age at point of lay insert ignore into journalissuearticles values(POL);, age at 50% egg production, age at peak level, peak egg production level and percistency, mortality and egg production insert ignore into journalissuearticles values(HH:Hen-Housed; HD:Hen-Day); at the end of the 43rd weeks of age of hybrid genotypes insert ignore into journalissuearticles values(Nick Chick, Brown Nick, Isa Brown and Hisex); rising in the integrated layer operations in Konya province. The mean values of selected traits of totally 25 flocks were evaluated. According to the results obtained; LW of brown genotypes were almost 270 g higher insert ignore into journalissuearticles values(P<0.01); than white genotypes at 18th weeks of age. Egg production insert ignore into journalissuearticles values(HH); at 43rd weeks of age for Nick Chick, Brown Nick, Isa Brown and Hisex strains were found as 152.9 insert ignore into journalissuearticles values(%84.0);, 149.35 insert ignore into journalissuearticles values(82.06);, 139.19 insert ignore into journalissuearticles values(%76.5); and 145.0 insert ignore into journalissuearticles values(%79.7);, respectively. This results implies that brown and white egg layers should be judged for egg production efficiency. Differences between brown and white egg layers for egg production in same operation were not statistically significant but the differences between the operations were important insert ignore into journalissuearticles values(P<0.01);. There were no significant relationship between flock uniformity and the other production traits. On the other side, between age at 50% egg production and egg production properties insert ignore into journalissuearticles values(HD, HH; % and number); statistically significant insert ignore into journalissuearticles values(P<0.01); negative correlation coefficients insert ignore into journalissuearticles values(r<=-0.75); were determined. For HH egg production, the linear regression prediction equation below which has all parameters statistically significant insert ignore into journalissuearticles values(P<0.01); were determined. Egg production number insert ignore into journalissuearticles values(HH); = 290-1.25 Age at 50% Egg Production + 0.114 Age at Peak Level + 0.0624 Percistency. With same properties, for %HH and HD insert ignore into journalissuearticles values(number and %); egg production, statistically significant insert ignore into journalissuearticles values(P<0.01); regression equations were determined, too.
Keywords : Yumurtacı piliç, hedef CA, üniformite, performans, korelasyon, regresyon

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