Department of Animal Resource & Science, Dankook University, Cheonan, South Korea.
Vet Med Sci. 2022 Mar;8(2):654-659. doi: 10.1002/vms3.745. Epub 2022 Feb 26.
BACKGROUND/AIM: The condition of footpad is an important aspect of poultry welfare. This is a problem that plagues the poultry industry because it occurs whether birds are reared in the cage or on the floor. It is reported that feeding phytase to floor-reared broiler chicks could ameliorate footpad lesions, which is related to the reduction of litter moisture. However, some studies reported that phytase supplementation could ameliorate footpad lesions, but did not affect litter quality. Therefore, phytase supplementation may have other potential mechanisms to improve the footpad lesions. Cage-reared broiler chicks were used in this study because they had no access to litter.
A total of 234 1-day-old broiler chicks were randomly assigned to three groups based on the initial body weight (42.22 ± 0.18 g) with six replicate cages and 13 birds (mixed sex) per cage. The experimental period was 45 days. Dietary treatments were based on a corn-soybean meal-basal diet and supplemented with 500 and 750 FTU/kg Saccharomyces pombe expressed phytase. The unit of phytase (FTU) was defined as the amount of enzyme that catalyzes the release of one micromole phosphate from phytate per minute at 37°C and pH 5.5.
We found that dietary supplementation of S. pombe expressed phytase could improve calcium and phosphorus digestibility and subsequent improvement in toe ash, thus ameliorating footpad lesions in broiler chicks with no access to litter.
背景/目的：脚垫状况是家禽福利的一个重要方面。这是一个困扰家禽业的问题，因为无论是在笼养还是在地面饲养，都会出现这种情况。据报道，在地面饲养的肉鸡雏鸡日粮中添加植酸酶可以改善脚垫病变，这与减少垫料水分有关。然而，一些研究报告称，植酸酶的添加可以改善脚垫病变，但不会影响垫料质量。因此，植酸酶的添加可能有其他潜在的机制来改善脚垫病变。本研究中使用笼养肉鸡雏鸡，因为它们无法接触垫料。
234 只 1 日龄肉鸡雏鸡，根据初始体重（42.22±0.18 g）随机分为 3 组，每组 6 个重复笼，每个笼 13 只（雌雄混合）。试验期为 45 天。日粮处理基于玉米-豆粕基础日粮，并添加 500 和 750 FTU/kg 毕赤酵母表达植酸酶。植酸酶的单位（FTU）定义为每分钟在 37°C 和 pH 5.5 条件下，催化从植酸盐中释放 1 微摩尔磷酸盐所需的酶量。
我们发现，日粮中添加毕赤酵母表达植酸酶可以提高钙磷的消化率，进而改善趾灰分，从而改善无法接触垫料的肉鸡雏鸡的脚垫病变。
