In ovo technology is proposed as a method for early stimulation of intestinal microbiota, which protects animals from heat-induced gut dysbiosis. A study was carried out to evaluate meat quality traits in fast-growing chickens stimulated in ovo with trans-galactooligosaccharides (GOS) and exposed to heat stress. On the day 12 of egg incubation, 3000 fertilised eggs (Ross 308) were divided into: prebiotic group (GOS) injected with a single dose of 3.5 mg GOS/egg, saline group (S) injected with physiological saline and control group (C) un-injected. After hatching, 900 male chicks were reared in floor pens: three groups (GOS, S and C, 6 pens/group, 25 birds/pen) were reared in thermoneutral conditions (TN) and three groups (GOS, S and C, 6 pens/group, 25 birds/pen) were reared under heat stress conditions (HS) induced on day 32 (30 °C) for 10 days. At 42 days of age, 15 randomly chosen birds/treatment/temperature were slaughtered and the pectoral muscle (PM) was removed for analyses. Data were analysed by GLM procedure in a 3 × 2 factorial design. Treatment had no effect on PM weight; however, PM from GOS group was slightly heavier (+9.7%) compared to C. pH and WHC were similar among groups. GOS and S birds had lighter (L*, p<.01) PM than C group; while, C group had a higher (p<.05) yellowness index (b*) compared to S group. Proximate composition, cholesterol and intramuscular collagen contents were not affected by treatment. Total content of saturated fatty acids (SFA) and monounsaturated fatty acids (MUFA) was similar among treatment groups, while total polyunsaturated fatty acids (PUFA) content and n-6 PUFA were slightly lower in GOS group compared to S one. Heat stress had a detrimental effect on PM weight (p<.01) and increased meat pH (p<.01). PM from HS chickens was darker (p<.05) with a higher b* index (p<.05) than TN group. Compared to TN conditions, heat stress increased (p<.01) lipid content (+0.44%) but decreased (p<.05) total collagen amount; differently, it did not affect total content of SFA, MUFA and PUFA, but increased total n-3 PUFA. Significant interactions between factors were found for lipid, ash and fatty acid composition: GOS decreased (p<.01) SFA and increased (p<.05) MUFA contents in HS birds. In conclusion, in ovo injection of GOS prebiotic had no negative effect on physico-chemical and nutritional properties of meat from fast-growing broiler chickens. Heat stress reduced PM weight and slightly affect meat quality.

In ovo delivery of GOS in fast-growing broiler chickens exposed to heat stress: implications for meat quality traits

Siria Tavaniello;Anna Slawinska;Micol Bertocchi;Rossella Mucci;PETRECCA, Valeria;Giuseppe Maiorano
2019

Abstract

In ovo technology is proposed as a method for early stimulation of intestinal microbiota, which protects animals from heat-induced gut dysbiosis. A study was carried out to evaluate meat quality traits in fast-growing chickens stimulated in ovo with trans-galactooligosaccharides (GOS) and exposed to heat stress. On the day 12 of egg incubation, 3000 fertilised eggs (Ross 308) were divided into: prebiotic group (GOS) injected with a single dose of 3.5 mg GOS/egg, saline group (S) injected with physiological saline and control group (C) un-injected. After hatching, 900 male chicks were reared in floor pens: three groups (GOS, S and C, 6 pens/group, 25 birds/pen) were reared in thermoneutral conditions (TN) and three groups (GOS, S and C, 6 pens/group, 25 birds/pen) were reared under heat stress conditions (HS) induced on day 32 (30 °C) for 10 days. At 42 days of age, 15 randomly chosen birds/treatment/temperature were slaughtered and the pectoral muscle (PM) was removed for analyses. Data were analysed by GLM procedure in a 3 × 2 factorial design. Treatment had no effect on PM weight; however, PM from GOS group was slightly heavier (+9.7%) compared to C. pH and WHC were similar among groups. GOS and S birds had lighter (L*, p<.01) PM than C group; while, C group had a higher (p<.05) yellowness index (b*) compared to S group. Proximate composition, cholesterol and intramuscular collagen contents were not affected by treatment. Total content of saturated fatty acids (SFA) and monounsaturated fatty acids (MUFA) was similar among treatment groups, while total polyunsaturated fatty acids (PUFA) content and n-6 PUFA were slightly lower in GOS group compared to S one. Heat stress had a detrimental effect on PM weight (p<.01) and increased meat pH (p<.01). PM from HS chickens was darker (p<.05) with a higher b* index (p<.05) than TN group. Compared to TN conditions, heat stress increased (p<.01) lipid content (+0.44%) but decreased (p<.05) total collagen amount; differently, it did not affect total content of SFA, MUFA and PUFA, but increased total n-3 PUFA. Significant interactions between factors were found for lipid, ash and fatty acid composition: GOS decreased (p<.01) SFA and increased (p<.05) MUFA contents in HS birds. In conclusion, in ovo injection of GOS prebiotic had no negative effect on physico-chemical and nutritional properties of meat from fast-growing broiler chickens. Heat stress reduced PM weight and slightly affect meat quality.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11695/87069
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