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首页> 外文期刊>Poultry Science >Phosphorus utilization in finishing broiler chickens: Effects of dietary calcium and microbial phytase
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Phosphorus utilization in finishing broiler chickens: Effects of dietary calcium and microbial phytase

机译：肉仔鸡对磷的利用：日粮钙和微生物植酸酶的影响

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A decrease in dietary P, especially in finishing broilers (21 to 38 d old), is a crucial issue in poultry production from an environmental and economic point of view. Nevertheless, P must be considered together with other dietary components such as Ca and microbial phytase. Different corn and soybean meal-based diets varying in Ca [low (LCa) 0.37, medium (MCa) 0.57, and high (HCa) 0.77%], and nonphytate P [nPP; low (LnPP) 0.18 and high (HnPP) 0.32%] content were tested with and without microbial phytase [0 or 500 phytase units (FTU)/kg]. Feed intake, BW gain, bone mineralization, and mineral retention were examined in 144 Ross PM3 broilers (22 to 38 d old) reared in individual cages. Growth performance was not significantly affected by the treatments. Nevertheless, a numerical decrease of ADG and ADFI was observed in HCa-LnPP and LCa-HnPP associated with an increase of feed conversion ratio. Decreased dietary Ca reduced tibia ash content (Ca, linear: P < 0.001; quadratic: P = 0.034) and tibia ash weight for the highest level of nPP (Ca × nPP; P = 0.035). In parallel, increasing dietary Ca reduced the flow of retained P (P = 0.022) but also tibia ash weight in LnPP diets (Ca × nPP; P = 0.035). The responses of the animals in terms of tibia ash content and P retention were improved by the addition of microbial phytase especially for the lowest P diets (nPP × phytase, P = 0.021 and P = 0.009; respectively). Phytase increased dry tibia weight, bone breaking strength, and tibia diameter in broilers fed the highest Ca diets (Ca × phytase; P < 0.05). We conclude that is possible to decrease P levels in finishing broilers, if the Ca content is appropriate. Nevertheless, decreasing the dietary P and Ca cannot allow a maximization of bone mineralization, but the optimal threshold remains to be determined.
机译：从环境和经济的角度来看，减少日粮中的磷，特别是在育成肉鸡（21至38 d）中，是家禽生产中的关键问题。但是，必须将P与其他饮食成分（例如Ca和微生物植酸酶）一起考虑。不同的玉米和豆粕基日粮的Ca值不同（低（LCa）0.37，中（MCa）0.57和高（HCa）0.77％）和非植酸盐P [nPP;在有和没有微生物植酸酶[0或500植酸酶单位（FTU）/ kg]的情况下测试了低（LnPP）0.18和高（HnPP）0.32％]含量。在单独笼中饲养的144头Ross PM3肉鸡（22至38天大）中检查了饲料摄入量，体重增加，骨矿化和矿物质retention留。处理对生长性能没有显着影响。然而，在HCa-LnPP和LCa-HnPP中观察到ADG和ADFI的数值下降与饲料转化率的增加有关。饮食中Ca的减少会降低胫骨灰分含量（Ca，线性：P <0.001;二次方：P = 0.034），而胫骨灰分的重量会导致最高nPP（Ca×nPP; P = 0.035）。同时，增加饮食中的钙减少了LnPP日粮中残留的P的流量（P = 0.022），也降低了胫骨灰分的重量（Ca×nPP; P = 0.035）。通过添加微生物植酸酶可以改善动物对胫骨灰分含量和磷保留的反应，尤其是对于最低磷饮食（nPP×植酸酶，分别为P = 0.021和P = 0.009）。在饲喂高钙日粮的肉鸡中，植酸酶增加了胫骨干重，断骨强度和胫骨直径（Ca×植酸酶; P <0.05）。我们得出结论，如果钙含量合适，则可以降低肉鸡的磷水平。尽管如此，降低饮食中的P和Ca不能使骨骼矿化最大化，但是最佳阈值仍有待确定。

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