發(fā)布時(shí)間：2019-07-03 18:20

【摘要】：本文以羅斯308肉雞為試驗(yàn)研究對(duì)象,研究低磷低蛋白日糧單獨(dú)或組合添加植酸酶和蛋白酶對(duì)肉雞生產(chǎn)性能、屠宰性能、養(yǎng)分利用率及生化指標(biāo)的影響,為植酸酶和蛋白酶在家禽養(yǎng)殖生產(chǎn)中的應(yīng)用提供理論依據(jù)。試驗(yàn)選用8日齡羅斯308肉雞168只隨機(jī)分為4個(gè)處理組,每組6個(gè)重復(fù),每個(gè)重復(fù)7只雞,第1組飼喂標(biāo)準(zhǔn)日糧組,第2組為低磷日糧添加500U/kg植酸酶組,第3組為低蛋白日糧添加150mg/kg蛋白酶組,第4組為低磷低蛋白日糧添加500U/kg植酸酶和150mg/kg蛋白酶組。試驗(yàn)結(jié)果表明:(1)低有效磷、低蛋白日糧中單獨(dú)或組合添加植酸酶和蛋白酶,可使肉雞的生長(zhǎng)性能達(dá)到標(biāo)準(zhǔn)日糧的水平,并能降低料重比,提高飼料利用率;(2)除低有效磷日糧添加500U/kg植酸酶提高肉雞的腹脂率外,其他日糧處理對(duì)肉雞的屠宰率、半凈膛率、全凈膛率、胸肌率和腿肌率均無(wú)顯著影響;(3)低有效磷、低蛋白日糧中單獨(dú)或組合添加植酸酶和蛋白酶對(duì)肉雞的血清生化指標(biāo)沒(méi)有顯著影響;(4)除了低蛋白日糧添加蛋白酶顯著提高了脛骨中鈣的含量,其他日糧處理對(duì)肉雞脛骨灰分和脛骨磷含量無(wú)顯著影響;(5)與標(biāo)準(zhǔn)日糧比較,低有效磷日糧添加500U/kg植酸酶后,磷、鈣的排泄量顯著降低了26.91%~39.96%和6.93%~23.83%,其表觀利用率分別提高了14.34%~49.96%和7.90%~27.60%;低蛋白日糧添加150mg/kg蛋白酶,蛋白質(zhì)和鈣的排泄量減少了4.10%~5.16%和1.57%~11.72%,其表觀利用率分別顯著提高了5.27%~6.98%和10.54%~22.73%;低有效磷、低蛋白日糧中聯(lián)合添加植酸酶和蛋白酶,蛋白質(zhì)、磷、鈣的排泄量分別減少1.99%~7.10%、16.50%~38.36%、4.09%~18.81%,其表觀利用率分別提高了3.19%~6.68%、17.20%~59.42%、14.07%~30.28%;(6)在低有效磷、低蛋白日糧中單獨(dú)添加植酸酶和蛋白酶對(duì)肉雞的脾臟、胸腺和法氏囊指數(shù)無(wú)顯著影響,但同時(shí)添加植酸酶和蛋白酶可使肉雞的法氏囊指數(shù)顯著增加。
[Abstract]:In this paper, Ross 308 broilers were used to study the effects of low phosphorus and low protein diet supplemented with phytase and protease on performance, slaughtering performance, nutrient utilization rate and biochemical indexes of broilers, so as to provide theoretical basis for the application of phytase and protease in poultry breeding and production. 168 8-day-old Ross 308 broilers were randomly divided into 4 treatment groups with 6 repeats in each group. The first group was fed with standard diet, the second group was fed with 500U/kg phytase group, the third group was fed with low protein diet supplemented with 150mg/kg protease group, and the fourth group was fed with low phosphorus and low protein diet supplemented with 500U/kg phytase and 150mg/kg protease group. The results showed that: (1) adding phytase and protease to low available phosphorus and low protein diet alone or in combination could make the growth performance of broilers reach the level of standard diet, reduce the ratio of feed to weight and improve the feed utilization rate. (2) except for low available phosphorus diet supplemented with 500U/kg phytase to increase abdominal fat rate of broilers, other dietary treatments had no significant effect on slaughter rate, semi-evisceration rate, total evisceration rate, breast muscle rate and leg muscle rate of broilers, (3) low available phosphorus and low protein diet supplemented with phytase and protease alone or in combination had no significant effect on serum biochemical indexes of broilers, and other dietary treatments had no significant effect on slaughtering rate, semi-evisceration rate, total evisceration rate, breast muscle rate and leg muscle rate. (4) in addition to the addition of protease to low protein diet, the content of calcium in tibia was significantly increased, but other dietary treatments had no significant effect on the content of tibia ash and phosphorus in tibia of broilers. (5) compared with the standard diet, the excretion of phosphorus and calcium decreased significantly by 26.91% 鈮，

本文編號(hào)：2509579