This experiment was carried out to determine the fertility performance and duration of fertility in the eggs laid after removing of male from cage reared under heat stress in the Japanese quails. In the study, 24 male and 72 female quails at 6 weeks of age were randomly divided into two groups (control and trial). Trial group was kept at high ambient temperature (33-42°C) and control group propagated in a 17-25°C environmental condition. The effects of heat stress on feed consumption, feed efficiency, egg production, egg weight were decreased. Also fertility ratio of the eggs laid after third day of removing of male were reduced (p<0.01). However, hatchability of fertile eggs and embryonic mortality were not statistically significant. As a result, the eggs laid after fourth day of removing of male in a high environmental temperature should not be incubated because of low fertility ratio.
[Show abstract][Hide abstract] ABSTRACT: How many males are sufficient? Experimental material consisted of 540 adult Japanese quails. Birds were in the same age (6 weeks old). Before start of experiment, birds kept in a separate sex cages for 14 days. In every period (8 days) we selected 144 hens and 36 cocks randomly then placed them in 36 units (twelve treatments and three replicates). The experiment was factorial (3*2*2) and used from completely randomized design. Meanwhile the experimental factors contains: 1. sex ratios 1m: 2f, 1m: 4f and 1m: 6f; 2. Spanish and white Japanese quail, and 3. interim or permanent attendance of cocks in cages. In the start of every period we randomly selected quails and arranged them, after three days, males were omitted from interim units and after that, eggs were collected several times a day, so stored in egg room for 7 days. Eggs were put in standard incubator. Data were analyzed using the GLM procedure of SAS. The ratio of 1m:2f had the highest fertility (p<0.05) compared with other treatments. Ratio of 1m:4f had high fertility, but there was no significant difference between 1:2 and 1:4 ratios. Fertility of the two strains with ratio of 1m: 4f in interim was significantly higher than permanent treatments. Spanish strain significantly had higher fertility in all treatments. Result of this experiment demonstrated that after successfully mating, when cocks were not in cages during laying, fertility was high.
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