Effects of different standardized ileal digestible lysine: net energy proportion in growing and finishing pigs
This experiment was performed to evaluate the optimal proportion of dietary standardized ileal digestible lysine (SID Lys) to net energy (NE) proportion in growing to finishing pigs. A total of seventy-two pigs were used at phase 1 (initial...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Korean Society of Animal Sciences and Technology
2020-03-01
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| Series: | Journal of Animal Science and Technology |
| Subjects: | |
| Online Access: | http://www.ejast.org/archive/view_article?pid=jast-62-2-198 |
| Summary: | This experiment was performed to evaluate the optimal proportion of dietary
standardized ileal digestible lysine (SID Lys) to net energy (NE) proportion in
growing to finishing pigs. A total of seventy-two pigs were used at phase 1
(initial body weight 37.23 ± 0.23 kilogram, for 42 d) and at phase 2
(initial body weight 54.16 ± 0.20 kilogram, for 77 d). They were
arbitrarily assigned to three treatments groups consisting of four duplicates
per treatment (six pigs in duplicates, respectively). Diet treatments were as
follows: CON = basal diets (phase 1, crude protein (CP): 19.1%; SID Lys: 0.94%;
SID Lys: NE proportion: 0.91 g/MJ / phase 2, CP: 17.0%; SID Lys: 0.84%; SID Lys:
NE proportion: 0.79 g/MJ), TRT1 (phase 1, CP: 18.0%; SID Lys: 0.92%; SID Lys: NE
proportion: 0.89 g/MJ / phase 2, CP: 15.8%; SID Lys: 0.8%; SID Lys: NE
proportion: 0.75 g/MJ), TRT2 (phase 1, CP: 17.3%; SID Lys: 0.82%; SID Lys: NE
proportion: 0.79 g/MJ / phase 2, CP: 14.8%; SID Lys: 0.7%; SID Lys: NE
proportion: 0.65 g/MJ). In phase 1 and 2, growth performance did not
meaningfully be affected when SID Lys: NE proportion decreased with reducing CP
content. In phase 2, the nitrogen digestibility of CON group in 11 week was
higher (p < 0.05) than other treatments. Also, marbling and
firmness scores of TRT2 group diets increased (p < 0.05)
compared with those of CON group, but dissimilarities of other meat qualities
did not be detected among treatments. In conclusion, introduction of NE system
can reduce negative problems introduced when dietary CP decreased. Also, 0.79
and 0.65 g/MJ of SID Lys: NE proportion is the optimal Lys: NE proportion to
achieve improved pork quality without impairing the growth performance in
growing-finishing pigs, respectively. |
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| ISSN: | 2672-0191 2055-0391 |