REFERENCES
- BRAY, D. J., R. C. JENNINGS and T. R. MORRIS, 1964. The effects of early and late maturity on the protein requirements of pullets. Paper read at March 1964 meeting of W.P.S.A., U.K. Branch.
- HURTWITZ, S. and P. GRIMINGER 1960. Observations on the calcium balance of laying hens. J. agric. Sci. 54: 373–377.
- MORRIS, T. R. and S. FOX 1960. The use of lights to delay sexual maturity in pullets. Brit. Poult. Sci. 1: 25–36.