氨基酸缺乏对母犊牛生长和日粮养分消化代谢的影响

孔凡林,李媛,唐梦琪,马满鹏,付彤,刁其玉,成思源,屠焰

Effects of Amino Acid Deficiency on Growth Development, Dietary Nutrients Digestion and Metabolism in Heifers

FanLin KONG,Yuan LI,MengQi TANG,ManPeng MA,Tong FU,QiYu DIAO,SiYuan CHENG,Yan TU

表8 赖氨酸、蛋氨酸、苏氨酸缺乏对犊牛的氮代谢的影响

Table 8 Effects of Lys, Met and Thr deficiency on the nitrogen metabolism of calves

项目 Item	组别 Group				SEM	P 值 P value
项目 Item	PC	PC-Lys	PC-Met	PC-Thr	SEM	P 值 P value
摄入氮 N intake (g·d^-1)
135-138 d	97.57	97.54	96.87	99.66	0.93	0.76
176-179 d	104.07	105.20	105.29	118.60	2.73	0.23
粪氮 Fecal N (g·d^-1)
135-138 d	30.77	30.63	28.78	34.87	0.86	0.07
176-179 d	26.10	26.37	25.85	33.88	1.27	0.07
尿氮 Urine N (g·d^-1)
135-138 d	31.14	29.66	32.08	26.73	1.01	0.27
176-179 d	32.93b	48.66a	40.88ab	40.86ab	1.76	0.01
吸收氮 Absorded N (g·d^-1)
135-138 d	66.79	66.91	68.10	64.78	1.12	0.79
176-179 d	77.97	76.33	79.44	84.72	2.09	0.61
沉积氮 Retained N (g·d^-1)
135-138 d	35.66	37.25	36.02	38.05	1.48	0.94
176-179 d	45.04	30.18	38.56	43.86	2.14	0.06
总排出氮 Total N excretion (g·d^-1)
135-138 d	61.91	60.29	60.86	61.61	1.28	0.97
176-179 d	59.03	75.02	66.73	74.74	2.35	0.05
N消化率 Absorbed N of intake N (%)
135-138 d	68.33	68.51	70.39	64.97	0.88	0.18
176-179 d	74.80	72.58	75.41	71.44	0.69	0.12
N利用率 Retained N of intake N (%)
135-138 d	36.36	37.99	37.22	38.15	1.38	0.97
176-179 d	43.24a	28.81b	36.42ab	36.96a	1.62	0.01
N的生物学价值 Biological value of N (%)
135-138 d	53.04	55.05	52.69	58.56	1.73	0.64
176-179 d	57.64a	39.78b	48.33ab	51.73a	2.04	0.01