J. Anim Sci.
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J. Anim Sci. 1988. 66:2459-2467.
© 1988 American Society of Animal Science
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The Influence of High Planes of Nutrition on Skeletal Growth and Development of Weanling Horses1

K. N. Thompson2, S. G. Jackson3 and J. P. Baker3

University of Kentucky, Lexington 40546-0099

Abstract

Effects of high dietary levels of energy, protein and Ca and deficient levels of Ca on skeletal growth and development in the equine were studied in two experiments. The weanlings were fed grain-based diets. In Exp. 1, Group 1 (Ctl) received all nutrients at NRC recommended levels for growth; Group 2 (HE) received 150% of their digestible energy (DE) requirement; Group 3 (LC) received 150% of DE and 35% of Ca requirements. In Exp. 2, Group 1 (Ctl) again received all nutrients at NRC recommended levels for growth; Group 2 (HEP) received 150% of DE and 275% of CP requirements; Group 3 (HEPC) received 150% of DE, 275% of CP and 500% of Ca requirements. In addition, all groups had access to pasture. The HE treatment resulted in greater (P < .10) increases in BW and total cortical width. However, LC weanlings had lower (P < .10) gains in third metacarpal length and radiographic bone density. Cumulative increases in BW and wither height were greater (P < .10) for the HEP and HEPC weanlings than for the Ctl weanlings. Increases in third metatarsal length also were greater (P < .10) for HEP weanlings than for Ctl weanlings. Higher planes of nutrition increased body weight gains and growth rate of several long bones. However, skeletal development (e.g., cortical area) may be compromised by a high rate of growth.

Footnotes

1 Journal Paper 86-5-278 of the Univ. of Kentucky Agric. Exp. Sta.

2 Dept. of Vet. Sci., Gluck Equine Res. Center.

3 Dept. of Anim. Sci.






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