Body weight and height fins of heifer herdat camp 6 of TH Nghe An Dairy Food Joint Stock Company
Experiments to determine the body weight (KLCT) and height of fins (CV) of the lactated calf herds were conducted at camp 6 of TH Dairy Food Joint Stock Company in Nghe An during the period from December 5 years. 2015 to June 24, 2020 aims to build equations for estimating body mass by age to ensure high accuracy applied to production. 1807 calves aged 3 to 25 months born between August 12, 2014 - March 27, 2015 weighed and measured their fin height between December 5, 2015 - April 24, 2017 from 1 to 2 times . Results: The body weight and fin height of the gilts at camp 6 were similar to that of American Holstein calves at some stage and higher than New Zealand calves. Period 3 to 10 months weight gain higher than the following period. The following equations can be applied to estimate the Competitive capability and CV by calf age (from 3 to 25 months): KLCT = - 10.56 + 37.31 x Tuoi- 0.6289 x Tuoi2 + 0.000938 Tuoi3 (Low / High = KLCT +/- 10% of KLCT); CV = 78.67 + 5,696 x Tuoi - 0.2206 x Tuoi2 + 0.003627Tuoi3 (Low / High = CV +/- 3.1% of CV). The following two equations can be applied to estimate the Competitive capability from CV and vice versa: Competitive capability (kg) = 4230 - 117.6 x CV + 1.053 CV2 - 0.002860 x CV3; CV (cm) = 74.69 + 0.2265 x KLCT - 0.000389 x KLCT2 + 0.0000004 x KLCT3.
