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- W1959043973 abstract "During the transition rainy-dry and dry season in a dry tropicalforest, 166 beef heifers with 636 ± 2.46 days old and 219.62± 15.68 kg average body weight (BW) were assigned by BW, uterineconditions, ovarian structure, and racial predominance to threeexperimental treatments (S = common salt, SM = complete mineralsupplement with 13.6% of P and 24% Ca, and SMP = protein plus mineralsupplement with 42.5% PC and 0.58% P) 139 days before matting and 103in matting. S and SM were given ad libitum and SMP about 700g/animal/d. Body weight changes, body condition scores (BCS),reproductive tract evolutions, and pregnancy rate were evaluated. Inaddition, in blood serum, concentration of minerals, urea and nonesterified fatty acids (AGNE) were measured. The animals were rotatedin 122 ha divided in six paddocks of Cynodon sp. and Brachiaria sp.fertilized previously with urea (50 kg/ha). The evaluation of the offerof forages showed concentrations of nutrients and dry matter (> 34kg DM/AU/d) adequate for beef cattle production. SM and SMPsupplementations had no significant effect on BW or BCS of the animals.Nevertheless, considering the season of the year when the experimentwas conducted, the average growth rate (0.483 kg/animal/d) was adequatefor the general management of the herd, mainly in relation to pasturemanagement. No significant differences among treatments were found forblood chemistry, uterine evolution, ovarian structure, and pregnancy(84, 84.1 and 92% of pregnancy for S, SM, and SMP, respectively). Underthe experimental conditions, the mineral or protein plus mineralsupplementations did not improve the biological response of theanimals. Only rational management of pasture provides adequate vegetalmaterial in quality and quantity, and consequently, satisfactorynutrition." @default.
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- W1959043973 date "2009-09-01" @default.
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- W1959043973 title "Mineral proteic supplementation of grazing beef heifers in the central plains of Venezuela." @default.
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