Effect of high levels of calcium phosphorus with and without dietary vitamin d on laying performance of hens given access to sunshine in the tropics and
1969
Buamah, T.F., Animal NutrWon Laboratory, Division of Animal Husbandry, Pong Tamale.
An experiment was conducted in a high temperature environment in northern Ghana to study the effect of higher levels of calcium and phosphorus, with and without vitamin 03, on the laying performance and egg characteristics of hens given access to direct sunshine. Levels of calcium and phosphorus studied were 3.5 and 4.25% Ca in all combinations with 0.6 and 0.75% inorganic phosphorus (Pi) against a control of 2.75% Ca and 0.45% Pi. Dietary level of vitamin 03 was 300 i.c.u./lb. Differences in egg production and egg weights due to different combinations of calcium and phosphorus, with and without dietary vitamin 03, were small and insignificant (P0.05). Addition of dietary vitamin 03 resulted in a slight increase in egg production but egg weight was slightly decreased. Egg shell weights at all levels of calcium and phosphorus were increased by dietary supplementation of vitamin D3, the over-all effect being significant at P0.05. Without dietary vitamin 03, shell weights varied with no distinct trend. Sunshine vitamin D3 alone seemed to be insufficient for increasing egg production and shell weight. Feed consumption and utilization were not significantly affected by either levels of calcium and phosphorus or dietary vitamin D3.
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