The efficiency of utilization of metabolizable energy and apparent absorption of amino acids in sheep given spring- and autumn-harvested dried grass

J C MACRAE, J S SMITH, P J S DEWEY, A C BREWER, David Stanley Brown, A WALKER

    Research output: Contribution to journalArticle

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    Abstract

    I. Three experiments wereconducted with sheep given spring-harvested dried grass (SHG) and autumn-harvesteddried grass (AHG). The first was a calorimetric trial to determine the metabolizable energy (ME) content of each
    grass and the efficiency with which sheep utilize their extra ME intakes above the maintenance level of intake. The second examined the relative amounts of extra non-ammonia-nitrogen (NAN) and individual amino acids absorbed from the small intestine per unit extra ME intake as the level of feeding was raised from energy equilibrium (M) to approximately 1.5 M. The third was a further calorimetric trial to investigate the effect of an abomasal infusion of 30 g casein/d on the efficiency of utilization of AHG.
    2. The ME content of the SHG (11.8 MJ/kg dry matter (DM)) was higher than that of AHG (10.0 MJ/kg DM). The efficiency of utilization of ME for productive purposes (is. above the M level of intake; k,) was higher when given SHG (k, 0.54 between M and 2 M) than when given AHG (kf 0.43 between M and 2 M).
    3. As the level of intake of each grass was raised from M to 1.5 M there was a greater increment in the amounts of NAN (P < 0.001) and the total amino acid (P < 0.05) absorbed from the small intestines when sheep were given the SHG (NAN absorption, SHG 5.4 g/d, AHG 1.5 g/d, SED 0.54; total amino acid absorption SHG 31.5 g/d, AHG 14.3 g/d, SED 5.24).
    4. Infusion of 30 g casein/d per abomasum of sheep given AHG at M and 1.5 M levels of intake increased P < 0.05) the efficiency of utilization of the herbage from kf 0.45 to kf 0.57. Consideration is given to the possibility that the higher efficiency of utilization of ME in sheep given SHG may be related to the amounts of extra glucogenic amino acids absorbed from the small intestine which provide extra reducing equivalents (NADPH) and glycerol phosphate necessary for the conversion of acetate into fatty acids.
    Original languageEnglish
    Pages (from-to)197-209
    Number of pages13
    JournalBritish Journal of Nutrition
    Volume54
    Issue number1
    Publication statusPublished - 1985

    Cite this

    The efficiency of utilization of metabolizable energy and apparent absorption of amino acids in sheep given spring- and autumn-harvested dried grass. / MACRAE, J C ; SMITH, J S ; DEWEY, P J S ; BREWER, A C ; Brown, David Stanley; WALKER, A .

    In: British Journal of Nutrition, Vol. 54, No. 1, 1985, p. 197-209.

    Research output: Contribution to journalArticle

    MACRAE, J C ; SMITH, J S ; DEWEY, P J S ; BREWER, A C ; Brown, David Stanley ; WALKER, A . / The efficiency of utilization of metabolizable energy and apparent absorption of amino acids in sheep given spring- and autumn-harvested dried grass. In: British Journal of Nutrition. 1985 ; Vol. 54, No. 1. pp. 197-209.
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    T1 - The efficiency of utilization of metabolizable energy and apparent absorption of amino acids in sheep given spring- and autumn-harvested dried grass

    AU - MACRAE, J C

    AU - SMITH, J S

    AU - DEWEY, P J S

    AU - BREWER, A C

    AU - Brown, David Stanley

    AU - WALKER, A

    PY - 1985

    Y1 - 1985

    N2 - I. Three experiments wereconducted with sheep given spring-harvested dried grass (SHG) and autumn-harvesteddried grass (AHG). The first was a calorimetric trial to determine the metabolizable energy (ME) content of each grass and the efficiency with which sheep utilize their extra ME intakes above the maintenance level of intake. The second examined the relative amounts of extra non-ammonia-nitrogen (NAN) and individual amino acids absorbed from the small intestine per unit extra ME intake as the level of feeding was raised from energy equilibrium (M) to approximately 1.5 M. The third was a further calorimetric trial to investigate the effect of an abomasal infusion of 30 g casein/d on the efficiency of utilization of AHG. 2. The ME content of the SHG (11.8 MJ/kg dry matter (DM)) was higher than that of AHG (10.0 MJ/kg DM). The efficiency of utilization of ME for productive purposes (is. above the M level of intake; k,) was higher when given SHG (k, 0.54 between M and 2 M) than when given AHG (kf 0.43 between M and 2 M). 3. As the level of intake of each grass was raised from M to 1.5 M there was a greater increment in the amounts of NAN (P < 0.001) and the total amino acid (P < 0.05) absorbed from the small intestines when sheep were given the SHG (NAN absorption, SHG 5.4 g/d, AHG 1.5 g/d, SED 0.54; total amino acid absorption SHG 31.5 g/d, AHG 14.3 g/d, SED 5.24). 4. Infusion of 30 g casein/d per abomasum of sheep given AHG at M and 1.5 M levels of intake increased P < 0.05) the efficiency of utilization of the herbage from kf 0.45 to kf 0.57. Consideration is given to the possibility that the higher efficiency of utilization of ME in sheep given SHG may be related to the amounts of extra glucogenic amino acids absorbed from the small intestine which provide extra reducing equivalents (NADPH) and glycerol phosphate necessary for the conversion of acetate into fatty acids.

    AB - I. Three experiments wereconducted with sheep given spring-harvested dried grass (SHG) and autumn-harvesteddried grass (AHG). The first was a calorimetric trial to determine the metabolizable energy (ME) content of each grass and the efficiency with which sheep utilize their extra ME intakes above the maintenance level of intake. The second examined the relative amounts of extra non-ammonia-nitrogen (NAN) and individual amino acids absorbed from the small intestine per unit extra ME intake as the level of feeding was raised from energy equilibrium (M) to approximately 1.5 M. The third was a further calorimetric trial to investigate the effect of an abomasal infusion of 30 g casein/d on the efficiency of utilization of AHG. 2. The ME content of the SHG (11.8 MJ/kg dry matter (DM)) was higher than that of AHG (10.0 MJ/kg DM). The efficiency of utilization of ME for productive purposes (is. above the M level of intake; k,) was higher when given SHG (k, 0.54 between M and 2 M) than when given AHG (kf 0.43 between M and 2 M). 3. As the level of intake of each grass was raised from M to 1.5 M there was a greater increment in the amounts of NAN (P < 0.001) and the total amino acid (P < 0.05) absorbed from the small intestines when sheep were given the SHG (NAN absorption, SHG 5.4 g/d, AHG 1.5 g/d, SED 0.54; total amino acid absorption SHG 31.5 g/d, AHG 14.3 g/d, SED 5.24). 4. Infusion of 30 g casein/d per abomasum of sheep given AHG at M and 1.5 M levels of intake increased P < 0.05) the efficiency of utilization of the herbage from kf 0.45 to kf 0.57. Consideration is given to the possibility that the higher efficiency of utilization of ME in sheep given SHG may be related to the amounts of extra glucogenic amino acids absorbed from the small intestine which provide extra reducing equivalents (NADPH) and glycerol phosphate necessary for the conversion of acetate into fatty acids.

    M3 - Article

    VL - 54

    SP - 197

    EP - 209

    JO - British Journal of Nutrition

    JF - British Journal of Nutrition

    SN - 0007-1145

    IS - 1

    ER -