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Effects of Lactation Number and Different Stage of Lactation on Milk Yield of Indigenous and Crossbred Cows in Bangladesh

Ahmad S
Department of Dairy Science, Bangladesh Agricultural University, Bangladesh

Hossain FMA*
Department of Dairy & Poultry Science, Sylhet Agricultural University, Bangladesh

Islam N
1Department of Dairy Science, Bangladesh Agricultural University, Bangladesh

Abstract/ Executive Summary:

A total of 54 samples were collected from 18 milking cows from which nine were indigenous and nine were crossbred to evaluate the effects of different lactation number and different stage of lactation on the milk yield. The average daily milk yield of indigenous and crossbred cows at 1st, 2nd and 3rd lactation were 1.311, 1.633, 2.072 and 8.917, 9.567, 10.167 liter/day/cow respectively and represented the significant difference (p<0.01) within the daily milk yield of different lactations. Milk yield increased gradually from 1st to 3rd lactation. The highest milk yield was recorded in 3rd lactation and lowest was in 1st. The mean milk yield of indigenous and crossbred cows at early, middle & later stages of lactations were 1.617, 2.094, 1.306 and 9.389, 10.222, 9.039 liter/cow/day respectively that revealed stages of lactation had significant effect (p<0.01) on milk yield per day. It was observed that milk yield decreased after 2nd stage of lactation and decreased linearly up to the end of lactation. The highest milk yield was recorded in 2nd stage of lactation and lowest was in 3rd stage of lactation. The overall milk production in different lactation for indigenous cows was 1.672 liter/day and for crossbred cows was 9.550 liter/day that may be concluded as crossbred cows are superior to indigenous in concern of milk yield.

Keywords: Indigenous cows; Crossbred cows; Lactation number; Stage of lactation; Milk yield.

Location:

Start Date:

End Date:

Program Area: Quality and Nutrition

Commodity: Milk

Objectives:

the present study was undertaken with the aim of investigating the effect of lactation order and stage of lactation on milk yield and fat content of raw milk from indigenous and crossbred dairy cows reared at village condition

Methodology:

Sources and Description of Animals: For this experiment a total of 18 milking cows belonging to different lactation number and different stages of lactation were selected. Nine of them were indigenous and the rest nine were crossbred. Both types of animals were reared under village condition. For this purpose three village areas Boyra, Sutiakhali and Kewatkhali surroundings to Bangladesh Agricultural University were selected. The animals of three lactation periods were used for this study. The information regarding milk yield were collected from the farmers with a related questionnaire. Collection of samples: During experimental period a total of 54 samples of raw milk were collected from different stages of lactation and order of lactation of the selected milking cows. Statistical analysis: The experiment was conducted by using Completely Randomized Design (CRD) to compute analysis of variance and to calculate the mean of each variance. Differences between means were evaluated for significant level following a modified Duncan’s Multiple Range Test (DMRT). "MSTAT" was used for this purpose. F-value was calculated to find out significant difference between treatment means. LSD (Least significant difference) was also used for the comparison between the treatment means.

Source of Information: International Journal of Natural Sciences (2011), 1(1):31-34

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The highest milk yield was recorded in 2nd stage of lactation and lowest was in 3rd stage of lactation. The overall milk production in different lactation for indigenous cows was 1.672 liter/day and for crossbred cows was 9.550 liter/day that may be concluded as crossbred cows are superior to indigenous in concern of milk yield.

Knowledge Management: Journal