Tolerance of growing pigs to trypsin and chymotrypsin inhibitors in chickpea (Cicer Arietunum) and pigeon pea (Cajanus cajan) meals.

Abstract

Proc. Aust, Soc. Anim, Prod. Vol. 18 TOLERANCE OF GROWING PIGS TO TRYPSIN AND CHEMOTRYPSIN INHIBITORS IN CHICKPEA (CICER ARIETINUM) AND PIGEON PEA (CAJANUS CAJAN) MEALS E, S. BATTERHAM*, L.M. ANDERSEN*, H.S. SAINI* and D.R. BAIGENT* Trypsin (TX) and chymotrypsin (Cl) inhibitors are widely grain legumes (Saini, 1989) and interfere with the digestion However, there is virtually no information on the Pig* growing pig to these inhibitors. The study aimed to provide distributed among of proteins in the tolerance of the this information, All diets were formulated to an estimated 15 MJ of digestible energy (DE) /kg The control diet was formulated from and a determined 0.75 g lysine/MJ DE. Inclusion levels of 250, 500 and 750 g/kg of Opal wheat and soyabean meal. chickpeas, dehulled Tyson chickpeas and dehulled Hunt pigeon peas were incorporated into the control diet at the expense of wheat and soyabean meal. Supplements of soyabean oil were used to maintain the dietary DE concentration, whilst supplements of free amino acids were used to maintain an adequate ratio TX and Cl concentrations in the of essential amino acids, relative to lysine. wheat and the protein sources were determined as outlined by Saini (1989). pigs were allocated at 20 kg live weight to each diet and diets were offered ad They were slaughtered at 50 kg live weight and carcass quality libitum. assessed. Sl 1 X Table 1 Response of pigs fed diets containing soyabean meal or graded levels of chickpea and pigeon pea meals ad libitum during the 20-50 kg growth phase There was no effect of inclusion level of the two chickpea meals on growth responses (P > 0.05). In contrast, the addition of pigeon pea meal linearly depressed growth rate (P < O.OOl), feed intake (P < 0.05) and feed conversion ratio (FCR) (P < 0.05). Mean growth responses and FCRs of pigs fed pigeon peas were inferior to those of the pigs fed the other protein sources (P < 0.001). These results indicate that g/kg of TX and Cl inhibitors pigeon pea meal, either the some other anti-nutritional the growing pig can tolerate at least 4.7 and 4.5 respectively, contributed by chickpea meals,, For tolerance to the protease inhibitors is lower, or factor/s contributed to the depressed performance. SAINI, HA. (1989). In 'Recent Advances of Research in Antinutritional Factors in LegumeSeeds', p. 249, editors J. Huisman, T.F.B. van der Poe1 and I.E. (Pudoc: Wageningen). - Liener. * North Coast Agricultural Institute, Wollongbar, N.S.W. 2480. 453