<div style="text-align: justify;">An experiment was conducted to evaluate the effect of different levels of roasted guar korma with or without mannanase supplementation on performance and carcass traits of broilers. Nine hundred and sixty day old commercial broiler chicks (Vencobb-400 strain) were divided into sixteen treatment groups of 60 each for six weeks. The diet without roasted guar korma served as control. The rest of the diets were formulated by incorporating 10%, 12.5%, 15%, 17.5 % and 20% levels of roasted guar korma, partially replacing soybean meal with and without enzyme (&szlig;-mannanase) at two &nbsp;levels (500 g/t and 750 g/t). Body weight gain at the starter phase was found to be non significant however at the finisher phase the differences were significant (P&lt;0.05) for T2 (563.35 g) and T5 (533.55 g) than the rest of the groups including control. Differences of feed consumption were significant (P&lt;0.01) at the end of starter as well as finisher phases whereas FCR differences were found to be non-significant. Dry matter digestibility was observed significantly better in T5 group. Significantly (P&lt;0.01) better nitrogen retention was observed in T5 and T6 groups than the groups having higher levels of roasted guar korma. Eviscerated weight differed significantly (P&lt;0.01) whereas non-significant differences were observed for giblet per cent, abdominal fat per cent, edible meat per cent and dressing per cent. It was concluded that 12.5 per cent of roasted guar korma with supplementation of &szlig; mannanase @ 500g/t can be safely added in the broiler diet without any adverse effect on performance, nutrient digestibility as well as carcass trait.</div>

Effect of different levels of roasted guar <em>(Cyamopsis tetragonoloba</em> &nbsp;L.) korma with or without &szlig;-mannanase supplementation on performance and carcass traits of broilers

<p style="text-align: justify;">The present investigation was carried out to estimate galactomannan content in mature seeds of 17 guar genotypes and activity of enzymes involved in galactomannan metabolism. Galactomannan content was found in the range of 16.82 (in IC 310630) to 36.68 per cent (in HG 3-2). The developing pods were sampled at 25, 32, 39 and 46 days after flowering (DAF) for a-galactosyltransferase, &szlig;-D-mannosidase &amp; &szlig;-1, 4-mannanase assay. The mean a-galactosyltransferase specific activity increased from 25 to 39 DAF (1557 to 3093 units) followed by decrease at 46 DAF (1484 units). The mean specific activity increased from 392 to 3166 units with the increase in galactomannan content from 16.82 to 36.68 per cent. Thus, this enzyme showed highly positive correlation with the galactomannan content. The mean specific activity of &nbsp;&szlig;-D-mannosidase increased gradually from 25 to 39 DAF (67 to 138 units) followed by sharp decrease at 46 DAF (32 units). The mean specific activity of &nbsp;&szlig;-1, 4-mannanase was found maximum at 25 DAF (102 units) and afterwards, it decreased continuously with advancement of days after flowering up to 46 days (9 units). On the whole, it can be said that the &szlig;-D-mannosidase requires prior activity of &nbsp;&szlig;-1, 4-mannanase for galactomannan catabolism while a-galactosyltransferase activity is positively correlated with galactomannan content and play a major role in guar gum synthesis and can be further used for gum improvement via genetic manipulation.</p>


Effect of different levels of roasted guar (Cyamopsis tetragonoloba L.) korma with or without ß-mannanase supplementation on performance and carcass traits of broilers

Galactomannan content and key enzymes of its metabolism in seeds of cluster bean [Cyamopsis tetragonoloba (L.) Taub.]