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Animal Products
Asian-Australasian Journal of Animal Sciences 1995;8(5): 499-503.
DOI: https://doi.org/10.5713/ajas.1995.499    Published online October 1, 1995.
Lifetime production performance of holstein friesian x Sahiwal crossbreds
M. Z. Chaudhry, M. Shafiq
The performance records of 410 Holstein Friesian crossbred cows belonging to seven genetic groups(F1, 3/4, 1/4, 5/8, 3/8, triple cross and miscellaneous cross) maintained at Livestock Production Research Institute, Bahadurnagar, Okara were analyzed for various parameters of lifetime traits. For the analysis 2 data sets were made. Data set I included all the cows disposed off from the herd which have completed at least one lactation while for data set II performance traits for m=nly first five lactations were considered. The data was analyzed by Mixed Model Least squares and Maximum Likelihood computer programme PC-I version. The least squares means standard errors for data set I (Periods are in days and milk yield is in litres) were 994.5 15.5, 1,877.0 70.9, 1,651.9 19.3, 2.533.7 36.5, 3.530.0 40.5, 15,785.2 320.0, 8.46 0.19, 5.66 0.16 and 3.79 0.08, respectively for age at first calving(AFC), Ist lactation milk yield(FLMY), productive life(PL), herd life(HL), total life(TL), lifetime milk yield(LTMY), milk yield per day of productive life(MY/PL), milk yield per day of herd life(MY/HL) and milk yield per day of total life (MY/TL). For data set II these values were 1,004.2 21.2, 2,220.5 113.1, 1,429.1 40.8, 2,302.1 73.3, 3,307.2 77.3, 13,189.7 667.4, 9.10 0.34, 5.66 0.25 and 4.02 0.18 in the same order. For data set I the effect of year of first calving was significant for AFC, FLMY, PL, HL, LTMY and MY/PL. The season of 1st calving was significant only for MY/PL. The effect of genetic group was significant for AFC, FLMY, MY/PL and MY/TL while the effect of parity was significant for all the traits. For data set II the effect of year of 1st calving was significant only for AFC, FLMY and PL while the season of 1st calving was significant for FLMY and PL while the effect of genetic groups was significant for MY/HL only. The lifetime production performance is in general close to the various estimates reported in the literature.
Keywords: Lifetime Production Performance; Crossbred Dairy Cattle; Pakistan

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