This study was conducted to determine the effects of some environmental factors on birth weight (BW) in Anatolian Buffalo calves born in the scope of the project of improvement of Anatolian Buffalo in public hand supported by General Directorate of Agricultural Research and Policies reared in Amasya province of Turkey. A total of 228 heads calves born between 2014 and 2015 were constituted the study material. Sex of calf, maternal age, birth season and location were assessed as affecting factors on BW. The data were analyzed using the SPSS statistical package program. Average BW was determined as 29.3 ± 0.43 kg. The effects of calf sex, maternal age and birth season on BW were detected to be statistically significant. The average BW of the male calves (32.2 ± 0.57 kg) was found to be higher than those of the female calves (26.0 ± 0.50 kg). BW of calves born in autumn had the lowest value. In addition, BW was tented to increase with advanced maternal age.

In this research, the effects of dam age and type of birth and sex of lambs on birth weight of Akkaraman lambs was investigated at village conditions in Konya province. Additionally, the heritability and repeatability of birth weight was estimated. The Least-squares means of birth weight was 4.07±0.04 kg. The effects of dam age, year, birth type and sex on birth weight were found statistically significant. The heritability and repeatability of birth weight were found as 0.052±0.04 and 0.130±0.04, respectively.

The present study was conducted to determine some environmental factors affecting birth weight, weaning weight and daily live weight gain of Holstein calves of a livestock facility in Izmir, Turkey. The data on 2091 calves born between the years 2005-2010 were used to assess the relevant parameters. Effects of calving year, calving month, calf gender and the interaction between calving year and calving month on calves’ birth weights were highly significant. The overall mean of birth weights was 39.6±0.15 kg. In addition, effects of calving year, calving month, gender, birth weight, weaning age, calving year x calving month, calving year x gender and calving year x calving month x gender interactions on weaning weight (WW) and daily live weight gain (DLWG) were highly significant. The overall means of WW and DLWG were respectively found to be 79.7±0.20 kg and 525±2.5 g. A one kilogram increase in birth weight resulted in an increase of 0.89 kg in weaning weight and a decrease of 1.26 g in daily live weight gain. Prenatal temperature-humidity index (THI) affected birth weight of calves (R2=0.67). Increasing THI from 50 to 80 resulted in 3.8 kg decrease in birth weight.