Effects of dietary starch and fiber concentration on post-prandial evolution of blood metabolites and hormones in lactating ewes and goats

In: Energy and protein metabolism and nutrition
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M.F. Lunesu Sezione di Scienze Zootecniche, Dipartimento di Agraria, University of Sassari, Viale Italia 39, 07100 Sassari, Italy.

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A.S. Atzori Sezione di Scienze Zootecniche, Dipartimento di Agraria, University of Sassari, Viale Italia 39, 07100 Sassari, Italy.

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C. Manca Servizio Ricerca per la Zootecnia, AGRIS Sardegna, Olmedo, Italy.

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A. Marzano Sezione di Scienze Zootecniche, Dipartimento di Agraria, University of Sassari, Viale Italia 39, 07100 Sassari, Italy.

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F. Correddu Sezione di Scienze Zootecniche, Dipartimento di Agraria, University of Sassari, Viale Italia 39, 07100 Sassari, Italy.

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A. Fenu Sezione di Scienze Zootecniche, Dipartimento di Agraria, University of Sassari, Viale Italia 39, 07100 Sassari, Italy.

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G.C. Bomboi Dipartimento di Medicina Veterinaria, University of Sassari, Via Vienna 2, 07100 Sassari, Italy.

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A. Cannas Sezione di Scienze Zootecniche, Dipartimento di Agraria, University of Sassari, Viale Italia 39, 07100 Sassari, Italy.

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This study explored the post-prandial hormonal evolution of mid-lactating ewes and goats fed a high starch diet (HS; 20.0% starch, on DM basis) and a low starch diet (LS; 7.8 starch, on DM basis) to understand why in this study ewes partitioned more energy in favor of body reserves and goats in favor of mammary gland. Blood post-prandial samplings were collected at 30, 60, 120, 180 and 240 min post feeding to analyze hormones and metabolites. Plasma NEFA (P=0.005), GH (P=0.0007) and leptin (P<0.0001) were affected by the effect of time. Plasma glucose concentration did not change during the time and was higher in ewes than in goats (60.34 vs 50.31±1.99 mg/dl; P<0.0001). Goats, had higher plasma GH (2.28 vs 1.47±0.37 ng/ml; P=0.037) and leptin concentration (21.08 vs 11.62±1.80 ng/ml; P<0.0001) whereas plasma insulin and IGF-I were higher in ewes than in goats (0.19 vs 0.14±0.02 μg/l; P=0.018; 154.31 vs 107.80±14.92 ng/ml; P=0.0036). The type of diet did not affect any of the metabolic parameters considered. In conclusion, this work suggested that the different hormonal profile observed between the two species could be the cause of the different nutrient partitioning.

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