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- W2914556502 abstract "Pigs exposed to heat stress (HS) reduce feed intake and consequently the consumption of AA. Adding extra protein-bound or free AA to the diet may correct the reduced AA intake of HS pigs. However, extra protein-bound AA may further increase the body heat load, whereas extra free AA does not affect the heat load of HS pigs. Two experiments were conducted. In Exp. 1, the performance depression because of HS, compared with thermal neutrality, was determined with 30 pigs (31.1 ± 1.2 kg BW) fed diets with AA only as protein or as a mix of protein and free AA. Heat stress pigs consumed 18 to 25% less Lys and Thr than thermal neutral. In Exp. 2, the effect of extra dietary protein-bound or free AA on performance and serum concentration of AA in 25 HS pigs (33.6 ± 0.65 kg BW) was evaluated. Treatments were as follows: CON, wheat-soybean meal-free Lys-Thr-Met diet; xP diet, 26% more protein than the CON diet; xAA diet, 24% or more of each AA than the recommended level. Pigs were fed ad libitum. Blood samples were collected between 1600 and 1700 h, when pigs were exposed to the highest ambient temperature (around 41.3 °C). Body temperature ranged daily from 39.9 to 41.1 °C. The performance data were reported already. Pigs fed the xP diet consumed more of all indispensable AA and dispensable AA than the CON pigs (P < 0.05), and more Arg, Ile, Asp, Glu, Gly, and Ser (P < 0.05) than the xAA pigs. Except for Arg, xAA pigs consumed more indispensable AA than the CON pigs (P < 0.05). Serum Arg, His, Lys, Phe, Thr, Trp, and Val, was higher (P < 0.05) in xP than in CON pigs. Except for Ile serum, indispensable AA were higher in xAA than in CON pigs (P < 0.05). Serum Ile, Leu, Thr, and Val were higher (P < 0.05), and Met tended to be higher (P < 0.10) in xAA than in xP pigs. The difference of Ile, Leu, Met, Thr, and Val between the CON and the xAA pigs was larger than that between the CON and the xP pigs (P < 0.05). Serum Asn and Tyr were higher, and Cys and Glu were lower (P < 0.05) in xP than in CON pigs. Serum Cys tended to be lower in xAA than in CON pigs (P < 0.10). Asp and Glu were higher (P < 0.05) in xAA pigs than in xP pigs. In conclusion, these serum AA results combined with the reported performance data indicate that extra free AA in diets for HS pigs may help to correct the reduced AA availability and performance of HS pigs, although higher levels of specific AA such as Ile and Met might be needed." @default.
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- W2914556502 date "2019-01-21" @default.
- W2914556502 modified "2023-10-18" @default.
- W2914556502 title "Extra dietary protein-bound or free amino acids differently affect the serum concentrations of free amino acids in heat-stressed pigs1" @default.
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- W2914556502 doi "https://doi.org/10.1093/jas/skz037" @default.
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