The Effects of Forced Molt Treatment on Body Weight, Oviduct and Some Blood Biochemical Contituents in White Hysex Hens

Institute of Animal Breeding, BG-2230 Kostinbrod, Bulgaria


CHOTINSKY, D., 2001. The effects of forced molt treatment on body weight, oviduct and some blood biochemical contituents in white hysex hens. Bulg. J. Agric. Sci., 7: 521-526

The experiment was carried out with 24 000 White Hisex laying hens on 68 weeks age at beginning of the trail, kept in cage batteries. A half of hens was subject of forced molt, and other half serves as a control.
The forced molt effect upon changes in the body weight, the reproductive apparatus, the electrolyte content, the total protein content, the protein fractions and total lipids in the blood plasma were studied.
It was determined that the body weight and the length and weight of the reproductive apparatus of the laying hens decrease with the reduction of the food, water and the lighted day length during 22 days forced molt.
The Na and K in the blood plasma and K in the erythrocites did not change considerably, while Na concentration in the erythrocites decreases considerably as a result of forced molt of the laying hens.The quantities of calcium and magnesium decreased strongly in the blood plasma of the hens subject to forced molt, compare to control group.
With the forced molt of the laying hens the total protein content did not suffer any changes, while in the individual fractions were observed some differences between the two groups.The quantity of total lipids in the blood plasma decreased as a result of the forced molt of the laying hens.

Key words: laying hens; forced molt; body weight; oviduct; blood plasma; erythrocyte; potasium; sodium; calcium; magnesium; total protein; albumins; globulins; fractions; total lipids