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Effect of diet metabolizable protein: metabolizable energy ratio of prepubertal dairy heifers on accelerate growth Trials were conducted in order to evaluate the effects of metabolizable protein: metabolizable energy (MP:ME) ratio on accelerated growth of prepubertal dairy heifers, and also the use of indirect methods of corporal growth for body weight estimation. First, twelve Holstein-Jersey heifers (90 days of average age) were housed in individual pens, with free access to water and shadow, until beginning of puberty (around 300 kg). Heifers were allocated on one of the two treatments, control (MP:ME = 39 g/Mcal) and high MP:ME ratio (MP:ME = 44,5 g/Mcal), according to a completely randomized statistical design. Biweekly, heifers were weighed and growth parameters were measured. Monthly, size and length of teats were taken, as indirect method for mammary growth assessment. Blood samples were also collected monthly to evaluate the plasmatic concentration of glucose, and urea nitrogen and progesterone. The MP:ME ratio observed were higher than those firstly predict by NRC (2001): 44.39 vs 39 g/Mcal and 52.98 vs 44.5 g/Mcal, respectively for control and high MP:ME treatment. There were no statistical effects of diet MP:ME ratio on dry matter intake, body weight (BW), hearth girth (HG), withers height (WH), hip width (HW), size and length of teats (P< 0.0001). With the same data a second study was conducted. Data of BW, WH, HW and HG monitored until 300 kg of BW, were used for regression analysis. BW was considered the dependent variable and growth parameters the independent one. Linear, quadratic and cubic effects of the independent variable were considered. There was no statistical effect of method for estimation BW (P<0.05). However, statistical effects were found to age and interaction of age and method for estimation BW (P< 0.0001). Linear regression of WH and HW underestimated the BW on age range from 11-13 months. For 6-7.9 months all linear regression of corporal parameters overestimate the values of BW (P<0.05). On age range from 3-5.9 months only linear regression of WH overestimate the values of weight (P<0,05). Between 6-7.9 months, the regression equation proposed by Heinrich; Rogers; Cooper (1992) underestimated the BW compared with mechanic scale. In conclusion, measures of growth and corporal parameters were not influenced by diet MP:ME ratio. Use of indirect methods of body weight estimation is efficient to estimate the BW of crossbreed heifers, at the same manner as the Heinrich; Rogers; Cooper (1992) proposed equation.

Efeito da relação proteína metabolizável: energia metabolizável da ração de novilhas pré-púberes em crescimento acelerado