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Determination of Quality of Milk from Different Genotype of Dairy Cows

M. R. Islam
Manager, Bangladesh Agricultural University Dairy Farm, BAU, Mymensingh-2202, Bangladesh

M. N. Hassan
Department of Dairy Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. S. R. Siddiki
Department of Dairy Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. A. S. Khan
Department of Dairy Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. A. Islam
Department of Dairy Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

The present study was conducted to investigate the milk quality from different genotype. A total 48 dairy cows belong to different genotypes such as Holstein cross, Jersey cross, Sahiwal cross and Red Chittagong were selected. Milk compositional viz. specific gravity, Acidity test, Fat test, Protein test, Solids-not-fat (SNF) test and total solids (TS) test were carried out. It was observed that the higher specific gravity of milk was obtained from Jersey cross and Red Chittagong genotype, which was significantly higher (P<0.01) than the other genotype of dairy cows. The highest acidity (%) was observed (0.165±0.014) in Red Chittagong and the lowest acidity (0.118±0.025) in Sahiwal cross. The highest fat (%) was observed from Red Chittagong cows milk which was statistically higher from Jersey cross and Sahiwal cross and the lowest fat (%) was found in the milk of Holstein cross cows. The highest SNF value was obtained from Jersey cross and the lowest from Sahiwal cross. On the other hand, Holstein cross and Red Chittagong was nearly similar. Red Chittagong milk sample showed the highest TS value and the lowest value was observed from Holstein cross. The highest protein value was found from Red Chittagong and the lowest from Holstein cross but the protein content of other two genotypes were nearly similar.

Keywords: Genotype, Dairy cow, Milk, Composition

Location: BAU Dairy Farm under the Department of Dairy Science, BAU, Mymensingh

Start Date: 01-07-2005

End Date: 30-12-2005

Program Area: Quality and Nutrition

Commodity: Milk

Objectives:

1. To investigate the milk quality from different genotype.

Methodology:

The present experiment was conducted at BAU Dairy Farm under the Department of Dairy Science, BAU, Mymensingh during the period from 1st July to 30th December 2005. For this experiment a total 48 dairy cows belonging to different genotypes such as Jersey cross, Sahiwal cross, Holstein Friesian cross and Red Chittagong were selected and the numbers of the animals of each of the genotypic classes were twelve. The animals of at least three lactation periods were only used for this study. Animals were placed hygienically in individual stall in a well – ventilated “face out stanchion barn” house. Attempts were made to keep all animals under same management condition. Calves were allowed to suckle during milking for milk-let down only. Cows were milked by hand twice daily, at morning (6:00 A.M.) and evening (4:00 P.M.) and keeping their calves at their feet during milking. Wheat bran, oil cake and rice polish were supplied to the cows. Morning and evening milk was recorded to get actual milk yield of cows in a day. Raw milk samples were collected and were transferred to the Dairy Technology Laboratory by keeping them in an ice-containing box for analysis. The parameters used to monitor the quality of milk were Specific gravity (sp. gr.), Acidity test, Fat test, Protein test, Solids-not-fat test, Total solids (TS) test. Specific gravity was performed by using Quevenne Lactometer. Fat test was performed by Gerber fat test methods. Acidity of milk was determined by titration method. Protein test was done by Kjeldhal method. Data collected from this experiment was analyzed statistically to find out the differences between treatment means. “Mstat” statistical package was used for this purpose. F-value was calculated to find out significant difference between treatment means. LSD (least Significance Difference) was also used for the comparison between the treatment means.

Source of Information: Bang. J. Anim. Sci. 2008, 37 (1) : 53 - 56; ISSN 0003-3588

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It was observed that the higher specific gravity of milk was obtained from Jersey cross and Red Chittagong genotype, which was significantly higher (P<0.01) than the other genotype of dairy cows. The highest acidity (%) was observed (0.165±0.014) in Red Chittagong and the lowest acidity (0.118±0.025) in Sahiwal cross. The highest fat (%) was observed from Red Chittagong cows milk which was statistically higher from Jersey cross and Sahiwal cross and the lowest fat (%) was found in the milk of Holstein cross cows. The highest SNF value was obtained from Jersey cross and the lowest from Sahiwal cross. On the other hand, Holstein cross and Red Chittagong was nearly similar. Red Chittagong milk sample showed the highest TS value and the lowest value was observed from Holstein cross. The highest protein value was found from Red Chittagong and the lowest from Holstein cross but the protein content of other two genotypes were nearly similar.

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