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Influence of the physical form of feeds and of the time of feeding concentrate on plasma concentrations of amino acids in ponies fed straw and concentrate diets



Influence of the physical form of feeds and of the time of feeding concentrate on plasma concentrations of amino acids in ponies fed straw and concentrate diets



Annales de Zootechnie 45(1): 53-61



A diet consisting of molassed straw (68%) and concentrate (25% maize and 7% soya-bean meal) was fed to achieve INRA recommendations for maintenance. In a first experiment, E1, a 2 times 2 crossover design was used with eight adult male ponies (average weight 202 kg) to compare two different diets: R1: pelleted concentrate and molassed straw fed simultaneously (at 8:00 and 16:00 hours); R2: pelleted concentrate fed two hours after the molassed straw (at 10:00 and 18:00 hours). In a second experiment, E2, a 3 times 3 latin square design was used with nine adult male ponies (average weight 198 kg) to compare three different diets: R3: combined concentrate and molassed straw pellets (fed at 8:00 and 16:00 hours); R4: pelleted concentrate and pelleted molassed straw fed simultaneously (at 8:00 and 16:00 hours); R5: pelleted concentrate fed two hours after the pelleted straw (at 10:00 and 18:00 h). Samples of jugular blood were taken at 8:00 (T), 10:00 (T+2), 11:00 (T+3), 13:00 (T+5), 14:00 (T+6), 16:00 (T+8), 17:00 (T+9) hours, for determination of plasma free amino acids (PFAA). R1 gave higher concentrations of total PFAA than R2. Daily average concentrations were 2687 with R1 and 2484 mu-mol/L with R2. Peak values were reached at T+2 with R1 (3639 mu-mol/L) and at T+6 with R2 (2712 mu-mol/L). In E2, daily average concentrations were higher with R5 (2745 mu-mol/L than with R4 (3443 mu-mol/L) and R3 (2608 mu-mol/L). Peak values were reached at T+6 (3087 mu-mol/L), T+2 (3443 mu-mol/L) and T+2 (2914 mu-mol/L), respectively. The positive effect on nitrogen digestion of feeding the concentrate after the straw seems to be affirmed, but could be less pronounced if the concentrate is pelleted.

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Accession: 008871642

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