Robel E J
U.S. Department of Agriculture, Agricultural Research Service, Livestock and Poultry Sciences Institute, Beltsville, Maryland 20705-2350.
Poult Sci. 1993 Mar;72(3):546-53. doi: 10.3382/ps.0720546.
Two experiments were conducted with Large White turkey hens housed individually in cages in a conventional house. In Experiment 1, three dietary treatments were used: an unsupplemented practical corn-soybean meal basal diet; the basal diet supplemented with 2.64 mg folic acid/kg of diet; and the basal diet supplemented with 5.51 mg folic acid/kg of diet. Eggs from hens fed 2.64 mg folic acid/kg of diet were injected with folic acid in 20 injection trials over two production cycles. The response data from dietary supplemental folic acid were analyzed on a production period basis using all of the hens, and on a subset of hens producing eggs in each production period, for hatchability of fertile eggs and poult weight. The response patterns in each case were similar. Incremental dietary supplemental folic acid levels produced a positive linear response pattern on the transfer of folic acid in eggs, but did not result in a hatchability increase over the unsupplemented folic acid basal diet. Hatchability increase did not occur for eggs injected at 25 days of incubation with 19.3 micrograms folic acid per egg in 20 injection trials over two cycles of production. The results of the study indicate that hatchability is not increased in turkey eggs from hens fed supplemental folic acid or with egg folic acid injections. However, egg and poult weights were significantly increased (P < .05) in eggs containing 6 to 7 mg folic acid/g of dried egg, from hens fed 5.51 mg folic acid/kg of diet.
两项实验使用了在传统鸡舍中单独饲养在笼子里的大白火鸡母鸡。在实验1中，采用了三种日粮处理方式：未添加的实用玉米 - 豆粕基础日粮；每千克日粮添加2.64毫克叶酸的基础日粮；以及每千克日粮添加5.51毫克叶酸的基础日粮。在两个生产周期的20次注射试验中，给饲喂每千克日粮含2.64毫克叶酸的母鸡所产的蛋注射叶酸。使用所有母鸡，并在每个生产周期中产蛋的母鸡子集中，分析日粮补充叶酸的反应数据，以研究受精蛋的孵化率和雏禽体重。每种情况下的反应模式相似。日粮中叶酸补充水平的增加在蛋中叶酸转移方面产生了正线性反应模式，但与未补充叶酸的基础日粮相比，并未导致孵化率提高。在两个生产周期的20次注射试验中，在孵化25天时给每个蛋注射19.3微克叶酸，所产蛋的孵化率并未提高。研究结果表明，给母鸡饲喂补充叶酸或对蛋注射叶酸，火鸡蛋的孵化率并未提高。然而，对于饲喂每千克日粮含5.51毫克叶酸的母鸡所产的、每克干蛋含6至7毫克叶酸的蛋，蛋重和雏禽体重显著增加（P < 0.05）。
