Studies on genetic and phenotypic parameters of some economic traits in different grades ofcross-bred (Friesian X Zebu) Cattle
Loading...
Date
1984
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Birsa Agricultural University, Ranchi
Abstract
Conclusions # On the basis of the findings of this investigation, the following conclusions were drawn –
(1) Among Friesian X Sahiwal cross-bred grades, half-breds were superior in respect to body-weights at different ages.
(11) Body-weight at 6 months of age can be used as a selection criterion, with considerable accuracy, for higher body-weights at different ages, higher first lactation yield, cumulative milk yields in first three and four lactations and better milk producing efficiency in Friesian X Sahival cross-breds.
(111) Half-breds were also superior among all Friesian cross-bred grades, so far as lactation yield; peak yields cumulative milk yields in first four and five lactations; average milk yields per day of lactation length and calving-interval; service period and inter-calving period were concerned. However, cous having 62.5% Friesian inheritance had shortest average age at first calving as well as ary period and highest MPEK and MPEKD values among all Friesian X Sahiwal cross-bred grades under reference.
(iv) The results of Multivariate analysis indicated that it cannot be assumed that grading up of Sahival cattle to the total replacement of their genes by those of Friesian origin, will lead to higher level of production.