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Livestock-Based Farming Systems, Renewable Resources and the Environment |
Two experiments were conducted to determine the effects of Catfish by-product meal (CB) replacement at 0, 50 and 100% of sea fish meal (FM) with and without Probiotic (P) suplementation in the diets for improve chicken. The digestibility trial was conducted with 24 male Luong Phuong chickens at 6 weeks of age and were placed in individual pens to collect excreta and ileal digesta. Six treatments (CB0, CB0P, CB50, CB50P, CB100, CB100P) were introduced to determine the apparent ileal (AID) and total tract (ATD) digestibility of nutrients and amino acids using Chromic oxide (Cr2O3) as indigestible marker.After 4 days of colleting excreta, the chickens were killed to collect the ileal digesta.
The AID and ATD of crude protein (CP) decreased with increasing CB in diets (P<0.05). Howerver the higher EE digestibility with higher CB in diets both AID and ATD digestibility.There were significantly reduce (P<0.05) total amino acid digestibility especialy isoleucine, leucine, lysine and ileal digestibility of arginine, isoleucine, leucine, lysine and methionine when increasing CB inclusion on the diets. The on-farm feeding experiment was conducted in 4 householders and with 3 best treatments with probiotic which were selected from digestibility trial. 60 chickens/househoder were used from 4-14 weeks of age then slaughter to evaluate the meat quality. Weight gain (WG), feed intake (FI) and feed conversion ratio (FCR) during 4-14 weeks of age were non significant differences for birds fed diets with various levels of CB, except cost/kg gain was reduced when icreasing CB in the diets. There were no significant differences among carcass weight, carcass, thigh and breast percentages. Howerver, there were higher (P<0.05) EE contents and some polyunsaturated fatty acids such as linoleic acid (C18:2), eicosapentanoic acid (EPA), docosa-hexanoic acid (DHA) and docosa-pentaenoic acid (DPA) of breast meat when increasing CB in the diets.