Abstract
Hy-Line W36 hens were fed diets containing zero or 6% corn oil (CO) from 26 to 38 wk of age. At 38 wk, the hens receiving the diet with 6% CO were divided into three groups. One group continued to receive the diet with 6% CO. The level of CO in the diet was reduced to zero or 3% in the other two groups. The hens previously fed the diet without CO continued to receive the control diet. Egg weight was significantly heavier when the diet contained 6% CO and was not significantly reduced when the level of CO was reduced to 3%. Egg weight from control hens was significantly lower than the EW from hens that had received CO in the diet until 38 wk but none thereafter. Hens fed the diet with CO consumed more energy than hens fed the control diet. However, when CO level was reduced to zero at 38 wk, the hens consumed less energy than hens fed the control diet. These findings indicate that the hen cannot adjust feed intake with diets based on changing energy concentration in the range from 2,783 to 3,089 kcal/kg.
Highlights
Hill et al (1956) reported that the dietary energy content controlled the amount of feed that a hen would consume
egg production (EP) was significantly higher in the cool house (92.5 vs 86.5) when the temperature of the house was allowed to cycle
The increased egg weight is a result of the hen not adjusting feed intake when the energy of the diet is increased
Summary
Hill et al (1956) reported that the dietary energy content controlled the amount of feed that a hen would consume. Harms et al (2000) found that the laying hen did not recognize an increase of 10% in dietary energy when 5.963% corn oil (CO) was included in the diet. This resulted in a 7% increase in energy intake and significantly increased egg weight (EW). Grobas et al (1999) suggested that the increase in energy intake was the primary cause of the increased EW They found no increased EW when feeding greater than 1.15% LIN, and that basal diet contained a higher level than 1.15%. An experiment was conducted to determine the influence of removing CO from the diet on EW and feed consumption
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