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Study of the effect of some external factors on the laying capacity of hens

, : Study of the effect of some external factors on the laying capacity of hens. Veterinarski Glas 18(7): 745-749

The influence of the mode of keeping, light, and temperature upon the laying capacity of New Hamshire and White Rock hens about 6-7 months old was studied. Two systems of keeping were examined: the floor system in which 3, 5 hens were kept on lm2 of floor area, and the battery system in which individual hens were kept in compartments /40 x 30 x 45 cm/. In winter the percentage daily laying capacity in the battery system was higher than that in the floor system by 13.7% in Dec., 17. 2% in Jan., and 5.9% in Feb. At the same time, in both systems it was greater in rooms with daylight than in rooms with electric light /1.8 W per lm2floor area/, by 9.2% in the floor system and 10% in the battery system. With respect to temperature, hens kept in the floor system at +10[degree] to + 15[degree]C laid, in the course of one month, 20.1% more eggs than those kept at -2[degree] to + 8[degree]C, and 18.1% more than those that lived at - 5[degree] to + 5[degree]C.


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