Addition of a fungal protease to low and high protein sorghum- or wheat-soyabean meal diets on ileal amino acid digestibility and performance of growing pigs

Citation
M. Cervantes et al., Addition of a fungal protease to low and high protein sorghum- or wheat-soyabean meal diets on ileal amino acid digestibility and performance of growing pigs, J ANIM FEED, 10(3), 2001, pp. 457-469
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences
Journal title
JOURNAL OF ANIMAL AND FEED SCIENCES
ISSN journal
1230-1388 → ACNP
Volume
10
Issue
3
Year of publication
2001
Pages
457 - 469
Database
ISI
SICI code
1230-1388(2001)10:3<457:AOAFPT>2.0.ZU;2-R
Abstract
Three experiments were conducted to assess the effect of adding a fungal pr otease to low (LP) and high protein (HP) diets on the apparent ileal digest ibility (AID) of amino acids (AA) and performance of growing pigs. In Exper iment 1, eight pigs, fitted with two cannulas (proximal duodenum and distal ileum) were used. Twenty eight pigs were used in Experiments 2 and 3 (27.5 and 24.0 kg initial body weights, respectively). Dietary treatments (T) fo r the three experiments were as follows: TL LP diet; T2. LP plus 0.5 g prot ease/kg feed (LP-P); T3. HP diet; T4. HP plus 0.5 g protease/kg feed (HP-P) . The diets included sorghum in Experiments 1 and 2, and wheat in Experimen t 3. The AID of AA, except for leucine, were higher (P <0.01) in pigs fed t he HP diets. The addition of protease to the LP diet increased (P <0.01) th e AID of AA, except for lysine. In contrast, addition of protease to the HP diet did not affect (P >0.10) the AID of AA Intestinal disappearance (ID) of AA was higher (P <0.01) in pigs fed the HP compared to the LP diets. Add ition of protease to the LP diet increased (P <0.05) the ID of AA, but was still lower than that of pigs fed the HP diets (P >0.05). Pigs fed the HP s orghum diets had a higher daily gain, feed intake and a better feed/gain ra tio (P <0.05) than pigs fed the LP diets; however, there was no effect (P > 0.05) of CP level in pigs fed the wheat diets. Addition of protease tended to depress performance of pigs fed the sorghum diets, but did not affect th e performance of pigs fed the wheat diets. These results suggest that lysin e and threonine intakes, rather than the amino acid digestibility are the f actors that limit growth in pigs fed LP-amino acid fortified, sorghum-soyab ean meal diets. These data also show no beneficial effect of adding a prote ase to sorghum- or wheat-based diets on the AID of AA and the performance o f growing pigs.