Israr-ul-Haq, Chohan

A Study On The Effects Of Intermittent Light On The Performance Of Japanese Quails (Coturnix Coturnix Japonica) - 1991

The study was aimed to find out the effect of different photo-periods on the body weight gain, feed consumption, feed efficiency, dressing percentage and Bone; meat ratio of J. quails. Light plays a vital role in the management of quails. The adequate light for quails should be sufficient enough to enable the birds to move about, facilitating to see, eat and drink without any extra exercise. One of the main factors, which needs further exploration is to fix up the hours of light necessary for better growth and economical production.

The present study was thus under taken to determine the appropriate and economical light dark cycle for best performance of Japanese quails, under local climatic conditions. The photo-periods provided in this experiment were 24 hours continuous light, 1 hour continuous light followed by 1 hour continuous darkness alternately, 1 hour continuous light followed by 2 hours continuous darkness and 1 hour continuous light followed by 3 hours continuous darkness to groups Li, L2, L3 and L4 respectively. 192 one day old J. quails were reared upto 6 weeks of age. Groups were further sub-divided into 3 replicates (La, Lb. La) of 16 quails each. The quails of all groups reared in battery brooders, where quails were provided floor space at the rate of 25. SQ. inches per bird, throughout the experiment.

Automatic programme timers with 25 watt bulbs were used; where controlled light was required. Feeding, watering. environmental and managemental conditions were made identical for all the birds. The birds reared under one hour continuous light, followed by 2 hours darkness. Grained more body wiehgt than that of birds of other three groups There were highly significant difference (P<0.01) in body weights of various groups of quails from 3rd to 5th weeks of age.

On applying DMR test, it revealed that the highest body weight was in group L3 followed by Li, L2 and L4 groups respectively.

The results on feed consumption by various - groups were also found to be highly significant (P<0.01)

Maximum feed was consumed by the birds kept under L3 group, followed by Li, L2 and L4 groups respectively. The observations on weekly feed conversion ratio and mortality % were found to be non-significant.

The dressing percentage increased significantly with age. Li group showed better dressing percentage compared with those of other 3 groups. There were highly significant difference (P<0.01) in the dressing percentage among various groups. DMR test revealed that Li group had better dressing percentage, followed by L2, L3 and L4 groups respectively.

The values for bone; meat ratio were found to he highly significant (P<0.01). The best bone; meat ratio were of group Li followed by L2, L3 and L4 groups respectively.

However DMR test revealed that there were non- significant difference observed in bone, meat ratio of groups L3 and L4.

Thus, the fore said study claimed that better productive growth of Japanese quails were under one hour light followed by two hours continuous darkness. There were also comparatively better results of 24 hours continuous light as compared to be L2 and L4 groups in our study.

Department of Livestock Production


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