Improvements in the Technique of Deutectomy of Newly Hatched Chicks, and the Effects of the Operation on Their Subsequent Development ,

The Application of Deutectomy for Reducing Initial Vitamin A Reserves in Newly Hatched Chicks, and Some Observations on the Apparent Consumption of These Reserves

“…It has been shown that deutectomy causes a lag in growth during the first two or three weeks (Sloan, 1936;and Harvey et al, 1955). The results of experiment 12 indidate that this lag is not a consequence of the reduction of vitamin A resources, notwithstanding the mobilization of these resources during the period of the lag.…”

“…During this period, also, there is a lag in the growth of deutectomized chicks (Harvey et al, 1955). To determine whether the apparently normal reduction of liver vitamin A during the first two weeks of life constitutes a threat to the well-being of chicks with low initial vitamin A supplies, the growth and survival of 17 deficient chicks fed the basal diet supplemented with 1,000 I.U.…”

The effect of reproduction phase of breeder hens, poult hatch time, and fatty acid supplementation of the breeder hen diet on livability, growth characteristics, and yolk and liver fatty acid composition in posthatch poults

“…The yolk sac remaining in the body cavity following hatch is a vital source of nutrients to the PH poult (Moran and Reinhart, 1980a). Deutectomizing (surgical removal of the remaining yolk sac) chicks at hatch delayed PH growth (Harvey et al, 1955;Murakami etal., 1992), verifying the importance of this remaining source of nutrients. As previously mentioned, egg wt increases with the age of the hen, and egg wt directly correlates with the subsequent wt of the hatchling.…”