Agriculture Reference
In-Depth Information
Table 21.3.
Effect of deleting a single amino acid from the diet on protein quality (
b
) and nitrogen deposition (ND) of fast-growing broilers (Cobb 500) in N balance trials.
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
Diets
BD
Lys
Met+Cys
Trp
Thr
Arg
Val
Ile
Leu
Phe+Tyr
Gly+Ser
His
Period I (
6
to 21 days)
Mean BW (g)
a
534 ±
85
434 ±
61
507 ±
70
443 ±
75
394 ±
70
472 ±
68
446 ±
73
483 ±
74
427 ±
66
444 ±
64
515 ±
74
449 ±
60
Dry matter intake (g/day)
b
72
±
6
57
±
4
71
±
5
61
±
6
51
±
6
59
±
6
55
±
6
62
±
6
53
±
4
56
±
4
65
±
5
58
±
3
N intake
(mg N/BW
k
0.67
/day)
4430 ±
121
4238 ±
117
4545 ±
143
4364 ±
95
4004 ±
41
4078 ±
32
3850 ±
138
4203 ±
152
4002 ±
101
3904 ±
136
3993 ±
153
4192 ±
252
N deposition
(mg N/BW
k
0.67
/day)
2960 ±
28
2466 ±
34
2604 ±
36
2510 ±
23
2387 ±
19
2424 ±
12
2386 ±
52
2505 ±
52
2402 ±
35
2414 ±
33
2556 ±
41
2532 ±
80
Protein quality (
b
×
10
-
6
)
366 ± 1.8
267* ± 1.8
275* ± 3.0
268* ± 2.5
268* ± 1.7
269* ± 0.7
279* ± 1.9
277* ± 0.8
271* ± 2.2
280* ± 4.5
303* ± 4.5
208* ± 1.7
Efficiency (
bc
-1
)
-
82
± 0.6
112
± 1.2
468 ± 4.4
125
± 0.8
75
± 0.2
107
± 0.7
123
± 0.3
77
± 0.6
71
± 1.1
58
± 0.9
229
± 1.3
Period II (
22
to 37 days)
Mean BW (g)
1603 ±
136
1512 ±
106
1514 ±
158
1469 ±
115
1437 ±
130
1506 ±
121
1490 ±
112
1526 ±
114
1392 ±
121
1593 ±
110
1580 ±
127
1566 ±
131
Dry matter intake (g/day)
131
±
6
117
±
4
123
±
7
102
±
5
114
±
5
110
±
4
104
±
3
120
±
4
75
±
4
121
±
6
118
±
5
117
±
8
N intake
(mg N/BW
k
0.67
/day)
3448 ±
54
3557 ±
118
3625 ±
115
2943 ±
72
3441 ±
88
3291 ±
130
3211 ±
120
3469 ±
93
2381 ±
69
3436 ±
37
3371 ±
79
3232 ±
58
N deposition
(mg N/BW
k
0.67
/day)
2417 ±
18
2042 ±
34
2137 ±
36
1955 ±
35
2092 ±
25
2009 ±
40
1940 ±
47
2091 ±
23
1559 ±
34
2049 ±
11
2005 ±
29
2100 ±
11
Protein quality (
b
×
10
-
6
)
451 ± 0.5
320* ± 2.1
339* ± 2.0
360* ± 0.9
344* ± 2.7
337* ± 2.5
326* ± 1.2
341* ± 3.4
323* ± 2.4
332* ± 2.3
327* ± 2.7
368* ± 4.8
Efficiency (
bc
-1
)
-
104
± 0.7
146
± 0.8
620 ± 1.5
164
± 1.3
99
± 0.7
137
± 0.5
156
± 1.6
97
± 0.7
92
± 0.6
77
± 0.6
301
± 3.9
Period III (
38
to 53 days)
Mean BW (g)
3205 ±
163
3042 ±
117
3028 ±
112
2993 ±
146
3027 ±
92
2989 ±
119
2998 ±
123
2807 ±
120
2811 ±
97
3014 ±
147
2910 ±
126
3032 ±
121
Dry matter intake (g/day)
153
±
4
109
±
4
140
±
1
121
±
2
131
±
2
105
±
4
129
±
2
114
±
4
86
±
1
108
±
2
112
±
3
132
±
3
N intake
(mg N/BW
k
0.67
/day)
2346 ±
64
1824 ±
58
2203 ±
40
1936 ±
39
2213 ±
44
1752 ±
69
2065 ±
36
1983 ±
46
1429 ±
25
1725 ±
29
1893 ±
46
2088 ±
60
N deposition
(mg N/BW
k
0.67
/day)
1610 ±
23
990 ±
23
1241 ±
19
1150 ±
18
1155 ±
18
982 ±
37
1173 ±
18
1084 ±
18
847 ±
14
992 ±
9
1035 ±
15
1234 ±
24
Protein quality (
b
×
10
-
6
)
611 ± 0.9
393* ± 2.9
430* ± 1.7
442* ± 1.1
389* ± 2.4
405* ± 1.3
425* ± 1.8
402* ± 1.9
422* ± 3.6
416* ± 5.5
398* ± 5.8
451* ± 3.0
Efficiency (
bc
-1
)
-
125
± 0.9
176
± 0.7
721 ± 1.8
191
± 1.2
119
± 0.4
164
± 0.7
185
± 0.9
117
± 1.0
108
± 1.4
93
± 1.3
362 ± 2.4
*Significantly different from balanced diet (BD) treatment (
P
< 0.05) according to Dunnett's test.
a
Mean ± standard error of mean (SEM).
b
Average of two collecting periods.
