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Lifetime Productivity and Repeatability Estimation of Selected Traits of Crossbred Cows in Savar Dairy Farm

MS Islam
Department of Animal Breeding and Genetics, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

A Akhtar
Department of Animal Breeding and Genetics, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

MA Hossain
Department of Animal Science, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

MF Rahman
Department of Animal Science, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

SS Hossain
Department of Animal Breeding and Genetics, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Abstract/ Executive Summary:

The study was conducted on 244 crossbred cows of (Central Cattle Breeding and Dairy Farm), Savar, Dhaka to evaluate the effect of different productive groups on their lifetime performance of various productive traits using twenty years data. Data were accumulated from a prescribed data sheet maintained by Central Cattle Breeding Station, Savar, Dhaka. Genetic groups for this experiment were Local Friesian (LF), Local Jersey (LJ), Local Hariana X Friesian (LH x F), Local Friesian X Local Friesian (LF x LF) and Local Jersey X Local Jersey (LJ x LJ). The studied parameters were age at puberty, lactation length, lactation yield, total milking days, and total milk yield in lifetime. The data were analyzed using Least-Squares Mixed Model and Maximum Likelihood Computer Program (Harvey, 1990). Analysis showed that genetic groups had a significant effect on age at puberty, lactation length and lactation yield (P<0.01), total milking days and milk yield in lifetime (P<0.001). From the result it was found that earliest age at puberty were in L x F (749.27±99.01). Lactation length and standardized lactation yield were also higher in L x F (258.69±20.04 days and 1408.80±83.60 kg respectively). Total milking days and milk yield were observed higher in (LH x F) with mean of 1468.30±198.58 days and 7340.32±1813.28 kg, respectively. The repeatability estimates of lactation length for genetic groups LF, LJ, LH x F, LF x LF and LJ x LJ were 0.24±0.09, 0.04(-ve), 0.10±0.05, 0.07±0.05 and 0.49±0.22, respectively. The same for lactation yield was 0.17±0.08, 0.27± 0 . 0 2 , 0.07±0.04, 0.17±0.08 and 0.03±0.05 respectively. From analysis it was revealed that in respect of productive performances the L x F genetic group was found superior compared to other groups but interns of total lifetime productivity, LH x F ranked the highest in the given environment. It is concluded that lifetime productivity needs to be considered as an appropriate guideline for selecting genetic groups for future productivity.

Keywords: Crossbred dairy cows, Lactation, Lifetime milk production, Productive traits, Repeatability

Location: Central Cattle Breeding Station (CCBS), Savar, Dhaka

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Cow

Objectives:

To find out superior animals suitable for future use of lifetime productivity, lifetime potential in different genetic groups and to estimate repeatability in some traits of dairy cattle of Bangladesh.

Methodology:

Data pertinent to this research work were collected from the prescribed data sheet as maintained at Central Cattle Breeding Station (CCBS), Savar, Dhaka. Records on a total of 244 cows were picked up and the cows were maintained on usual ration and identical management in the farm of years 20. The animals under study constituted five crossbred genetic groups such as Local x Friesian =L x F, Local x Jersey= (L x J), (Local x Hariana) x Friesian (L x H) x F), [(Local x Friesian) x (Local x Friesian) (L x F) x (L x F)] and (Local x Jersey) x (Local x Jersey) (LJ x LJ). The cows from each genetic group with reasonably sufficiently long productive life were considered rationally in this study. Milking animals at CCBS were usually culled when they are no longer able to produce calves because of senility. Therefore, length of productive lives of the cows in this study was supposed to be "Lifetime production" for each individual. This data collection and analytical procedure considered as materials and methods for this research work. Traits Considered for present study were age at puberty (AAP), lactation of length (LL), lactation yield (LY), total milking days in lifetime (TMDL) and total milk yield in lifetime (TMYL) and repeatability were Lactation length and Lactation yield. Statistical Analysis: Data were analyzed using Least- Squares Mixed Model and Maximum Likelihood Computer Program (Harvey, 1990). Analysis of variance (ANOVA) one-way is used to interpret the data. ANOVA test is used to compare the data for age at puberty; lactation length, lactation yield, total milk yield in lifetime, number of lactation completed in lifetime and number of milk days in lifetime. The level of significant is P < 0.05. This analysis is done by using SPSS version 13.0 for Windows program software.

Source of Information: Progressive Agriculture 29 (2): 168-177, 2018

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the compilation and analysis of data on various parameters, it is revealed that productive performances the L x F genetic group was found superior compared to other groups. But in terms of total lifetime productivity, LH x F ranked the highest given environment. It is concluded that lifetime productivity needs to be considered as an appropriate guideline for selecting genetic groups for the future productivity.

Knowledge Management: Journal