Akademik Veri Yönetim Sistemi
7. ULUSAL 3. ULUSLARARASI SÜRÜ SAĞLIĞI VE YÖNETİMİ KONGRESİ, Türkiye, 20 Ekim 2022, ss.234-235
Fertility and parturition parameters of Limousin (n=248) and Charolais (n=81) heifers at the age
of 9-11 mo that were imported from Hungary to Doğan Beef Farm were compared. Heifers were fed
TMR formulated to meet nutrient requirements. Heifers were inseminated upon the double-PG
synchronization and natural estrus. Calvings between 07:00 and 19:00 h were considered night
parturitions, those in other hours were considered day parturition. Conception and parturition were
categorized by season (cool/warm, cold, and hot). Data were analyzed using ANOVA, regression, and
chi-square. 14 L (5.65%) and 5 C (6.17%) were culled prior to parturition. 11 (3.55%) heifers (L=9 and
C=2) were culled immediately after parturition. Age at conception (543±7 d) and calving (827±7 d) and
pregnancy duration (285±0.6 d) did not differ by the breed. There was a breed effect on insemination
index (C=3.39±0.22 vs. L=2.32±0.10) and calf weight (C=46.1±0.8 vs. L=40.2±0.3 kg) (P<0.0001).
Females were lighter than males (F=39.5±0.3 vs. M=43.7±0.5 kg, P<0.0001). Ages at conception and
parturition prolonged 25 days with service number [Age at Conception, d=476.21±(Insemination
Number, N x 25.699); R2
=0.2470 and Age at Parturition, d =761.82±(Insemination Number, N x
25.265), R2
=0.2389]. Pregnancy duration prolonged with calf weight [Pregnancy Duration,
d=274.40±(Calf Weight, kg x 0.248), R2
=0.0298). There was no relationship between breed and
conception season. L (76.50%) become pregnant more after synchronization, whereas C (56.58%)
become pregnant more after natural estrus (X2
=29.0282, P<0.0001). Pregnancy rate at first three
services was higher in L (82.48%) than C (59.22%) (X2
=27.5870, P<0.0003). Parturition time and
season were not related to retained placenta rate and calf weight Calving ease was higher for L (58.12%)
than that for C (36.84%) (X2
=10.4244, P<0.0054). Complications at parturition was independent from
breed, calving ease, calf sex. In summary, insemination index was higher for C, whereas calving ease
was higher for L.