Amino Acid Digestibility in Six Sources of Meat and Bone Meal fed to Growing Pigs

Abstract Text:

An experiment was conducted to determine the standardized ileal digestibility (SID) of AA by pigs in 6 sources of meat and bone meal (MBM). Eighteen ileal-cannulated barrows (initial BW: 69.3 ± 4.4 kg) were randomly allotted to a replicated 4 x 9 incomplete Latin square design with 4 periods and 9 diets, therefore, a total of 8 replications per diet. One diet included 33% soybean meal (SBM) as the sole source of AA and 6 diets contained 1 source of MBM included at 9% and SBM included at 22% as the only AA containing ingredients. A N-free diet was used to determine basal endogenous losses of AA. The last diet was unrelated to the experiment. The SID of AA was calculated using the direct procedure for the SBM diet. The difference procedure was used to calculate the SID of AA for all sources of MBM. The SID of Lys was greater (P < 0.05) in MBM 4 than in MBM 2, MBM 3, and MBM 6, but not different from MBM 1 and MBM 5. The SID of Met was greater (P < 0.05) in MBM 1 and MBM 4 than in MBM 3 and MBM 6, but not different from MBM 2 and MBM 5. The SID of Thr was greater (P < 0.05) in MBM 1 than in MBM 2, MBM 3, and MBM 6, but not different from MBM 4 and MBM 5. The SID of Trp was the least (P < 0.05) in MBM 3 among MBM sources. In conclusion, the SID of indispensable AA varies widely among MBM sources.

Table 1. Standardized ileal digestibility (%) of indispensable AA in meat and bone meal

	Meat and bone meal						Pooled SEM	P-value
Item	1	2	3	4	5	6
Arg	94.7a	88.9ab	76.6c	90.3ab	92.1ab	85.2b	3.31	<0.01
His	93.1a	81.3c	63.6d	89.7ab	93.0ab	83.7bc	3.16	<0.01
Ile	90.1a	79.7bc	67.8d	87.1ab	88.6ab	75.7cd	4.19	<0.01
Leu	91.3a	82.3ab	66.6c	87.5ab	89.3a	77.4b	3.90	<0.01
Lys	86.5ab	77.1bc	62.8d	91.9a	83.2ab	66.6cd	4.65	<0.01
Met	86.6a	83.0ab	69.8c	87.3a	87.1ab	79.8b	2.94	<0.01
Phe	91.9a	82.4ab	69.9c	90.2ab	90.6ab	80.7b	4.09	<0.01
Thr	89.9a	75.3bc	63.2d	80.8ab	83.3ab	67.6cd	4.76	<0.01
Trp	93.4a	77.8b	63.3c	77.0b	96.7a	76.0b	5.53	<0.01
Val	87.0a	79.2ab	65.1c	85.7a	87.0a	74.8b	3.89	<0.01

^a-dMeans within a row lacking a common superscript letter differ (P < 0.05).

Keywords: amino acid digestibility, meat and bone meal, pigs