A study on fattening performance and carcass characteristics of calves of different breeds raised in bulgaria i. growth and feed to gain ratio

Kadiisky, E.; Zachariev, Z.I.; Ivanova, S.

Zhivotnov"dni Nauki 24(2): 9-18

1987


Accession: 004635378

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Abstract
In the years 1970/72 at the state cooperative farm "vakarel" was conducted a compartive study for establishing fattening performance, carcass characteristics as well as meat morphologic and technologic characteristics of calves of different breeds raised in this country. The experiment was carried out in two variants (A and B) with 390 male and 135 female calves of the following breeds: Simmental (S) male, Bulgarian Simmental (BS) male and female, Bulgarian Brown cattle (BB) male and female, Bulgarian Red cattle (BR) male and females, Dutch Black and White (DBW) male, and Gray Iskar cattle (GI) male. Two month old calves were brought at the districts of breeding of the respective breeds and were raised and fed under the same regimen i.e. up to the age of 6 months in free stall barns and therefore in tie stall barns. Variant A include 270 male and 135 female experimental calves of all the examined breeds that were fed up to six months according to a scheme aimed to attain 800 g average daily gain and after that according to norms for attaining 850-1000 g average daily gain. In variant B that was a repetitin of variant A, but with rations slightly higher, were included 120 young bulls of the studied breeds. Live weight of all the experimental animals was controlled every month and body measurements were taken at an average of 3, 6, 12, 15 and 18 months. Calves of the different groups were slaughtered at 6, 12, and 18 months of age and carcass evaluation and morphologic characteristic of meat was carried out. At an age of 12 and 18 months BS young bulls reached largest size but the size of DBW and BR, young bulls was smallest. With a medium level of feeding and an age of 18 months BS young bulls had an average live weight of 550 kg and 5.46 feed units gain ratio, BB young bulls.sbd.504 kg and 6.33 feed units, BR young bulls .sbd. 472 kg and 6.14 feed units, S young bulls .sbd.522 kg and 6.12 feed units DBW .sbd.481 kg and 6.27 feed units and GI.sbd.444 kg and 6.71 feed units gain ratio respectively. Live weight of female, was lower to that of male calves and this lower live weight of the different breeds in the respective age periods was in the following ranges: 6 months from 8 to 15%, 12 months from 7 to 15% 18 months from 10 to 19%.