This study aimed to assess the effect of watery supplementation of probiotic and/or apple vinegar on productive and physiological performances of broiler chickens (Ross 308) reared under high stocking density. Three hundred thirty-six unsexed one-day-old broiler chicks were randomly distributed to eight different treatments (3 replicates each) as follow: T 1 : Negative control (low stocking density (LSD) 12 birds/m 2 ; basal diet with no studied additives in drinking water), T 2 : LSD + probiotic, T 3 : LSD + apple vinegar, T 4 : LSD + probiotics + apple vinegar, T 5 : Positive control (high stocking density (HSD), 16 birds/m 2 ; basal diet with no studied additives in drinking water), T 6 : HSD + Probiotics, T7: HSD + apple vinegar and T 8 : HSD + probiotics+ apple vinegar. Probiotic mixture or/and apple vinegar were provided at a dose of 0.5% in drinking water. The body weight (BW), body weight gain (BWG), feed intake (FI) and feed conversion ratio (FCR) were measured every growth phase until the end of the study at 35 day of age. Also 6 birds of each treatment were used to evaluate carcass traits. Results revealed that administration of probiotics individually or in combined with apple vinegar significantly increased BW, BWG and FI, with a decreased FCR at grower (21 days of age) phase and market age (35 days of age), while apple vinegar additive groups had the lowest BW, BWG and FI, with increased FCR in both tested stocking density. In addition, enhanced carcass yield, some carcass parts (breast and thigh), blood constituents and beneficial bacteria count in small intestine of broilers provided by additives suggested. In conclusion, this study proves valuable effects of probiotic and apple vinegar on growth performance, carcass traits, and microbiological measurements at grower and finisher phases of broilers raised under high stocking density.
Defective soybean grains (DSBG) are considered improper for use as protein source in animal nutrition, what has not been evaluated yet. Thus, this study aimed to evaluate the in vitro fermentation and effects of DSBG in feedlot lamb diets. For that, two types of defective soybean grains (partially fermented and totally fermented) were obtained and compared to standard soybean grains (SSBG). In vitro, SBG (DSBG and SSBG) were evaluated alone or as component of a total mix ration which was also evaluated in vivo, where DSBG replaced SSBG in feedlot lamb diets. Before the studies, both types of SBG were sent to specialized laboratory where the presence of mycotoxins were no detected. Totally fermented SBG presented lower DM and carbohydrates content, but higher crude protein, fibre, and indigestible NDF contend than standard SBG. DSBG presented lower in vitro dry matter digestibility (IVDMD) than SSBG when evaluated alone, however when evaluated in experimental diets did not affect IVDMD. DSBG presented 57% lower in situ rumen degradable protein than standard SSBG (47.9 vs86.4%). In feedlot lamb diets DSBG did not affect nutrients intakes, apparent digestibility or animal performance. Thus, mycotoxins-free DSBG may totally replace SSBG in feedlot lamb diets.
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