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Effect of Milk Urea Nitrogen of Dairy Cows in Relation to Breed

M.R. Islam
Deputy Manager
ACI Godraj Ltd, Bangladesh

M.N. Uddin
Department of Livestock Production and Management, Sylhet Agricultural University, Sylhet, Bangladesh.

M.R. Akanda
Department of Pharmacology and Toxicology, Sylhet Agricultural University, Sylhet, Bangladesh.

M.M.H. Khan
Department of Chemistry and Biochemistry, Sylhet Agricultural University, Sylhet, Bangladesh.

M.A. Baset
Department of Livestock Production and Management, Sylhet Agricultural University, Sylhet, Bangladesh.

S.A. Belal
Department of Poultry Science, Sylhet Agricultural University, Sylhet, Bangladesh.

Abstract/ Executive Summary:

Milk urea nitrogen (MUN) of dairy cows was determined in relation to breed. A total of forty (40) Pabna and Red Chittagong dairy cattle each of twenty (20) were selected to investigate on the milk composition, nutritional status and milk urea nitrogen. Live weight of Pabna Cattle (187±14 kg) was higher than that of Red Chittagong cattle (174±4 kg). In Pabna cattle, milk yield (4 .94 kg), minerals (0.15%) and lactose (5.38%) was more than Rred Chittagong cattle milk yield (3.62 kg), minerals (0.12%) and lactose (5.37%) but fat (5.04%), protein (3.7%) and solid not fat (SNF) content (9.92%) was more in red Chittagong cattle than Pabna cattle fat (4.03%), protein (3.64%) and SNF (9.87%). The metabolic energy 74.93 MJ/day, dry matter 9.47 kg, crude protein 0.84 kg, ash 1.24 kg, crude fiber 2.18 kg and true digestible nutrient 5.43 kg was required for Pabna cattle and in Red Chittagong cattle metabolic energy 72.60 MJ/day, dry matter 9.14 kg, crude protein 0.660kg , ash 1.16 kg, crude fiber 1.93 kg and true dige stible nutrient 5.19 kg was required. Milk urea nitrogen (MUN) concentration was higher in Pabna cattle (38.15 mg/dL) than Red Chittagong cattle (RCC) (29.30 mg/dL).

Keywords: Dairy cows, Milk urea nitrogen, Red chittagong cattle, Pabna cattle

Location: Bangladesh Livestock Research Institute, Savar, Dhaka, Bangladesh.

Start Date: 25-09-2012

End Date: 24-10-2012

Program Area: Animal Health and Management

Commodity: Cow

Objectives:

To assess the status of milk urea nitrogen in Pabna cattle and Red Chittagong cattle.
To determine the milk composition and nutritional status of those two cattles

Methodology:

The study was conducted in Bangladesh Livestock Research Institute, Savar, Dhaka, Bangladesh. It was conducted from 25^th September to 24^th October, 2012. A total of forty dairy cows were randomly selected from Bangladesh Livestock Research Institute, Savar, Dhaka, Bangladesh. Among them, 20 cows were Pabna cattle and 20 were red Chittagong cattle. The average body weights of Pabna cattle was from 187 ± 14 kg and red Chittagong cattle was from 174 ± 4 kg. Age ranges from 2 years 6 months to 4 years 3 months. The data on management and feeding systems of cows were collected from 25^th September to 24^th October, 2012 from Bangladesh Livestock Research Institute. Feed and milk samples were collected from selected cows and prepared for laboratory analysis. Live weight of experimental cows were taken before feeding every morning and expressed in kilogram (kg). Live weight of each cow was measured using a calibrated electronic digital scale. The roughage and concentrate feeds were supplied 2 times daily by the respective workers to the selected cows, in morning and evening. The concentrate feeds were given before and roughage feeds were supplied after each milking. Cows consumed all the concentrates but sometime refused green grasses. For measuring feed intake, green grasses were weighed before supplying to the cow; next morning left over green grasses were weighed. Feed intake and refusals were recorded. The samples of feeds and refusals were analyzed for nutrient composition using the method described by AOAC. Energy values were adopted from some studies. Fresh water was ensured twice a day (morning at 5.45 a.m. and evening at 4.45 p.m.) during the data collection, but the amount of water was not measured. Milking was done manually twice a day; first in the morning at 6.00 a.m. and again in the evening at 5.00 p.m. Cows were housed in individual stall on a concrete floor in a face-out-stanchion barn throughout the period of data collection. Milk samples were warmed at room temperature (30⁰C) and mixed well. Then 10 mL of milk was deproteinised with 12% TCA solution (10 mL) in a test tube and allowed to stand for one hour and filtered through a Whatman Paper NO.1 and centrifuged at 3000 rpm for 30 minutes. Then clear supernatant (2 mL) was mixed with 2 mL of DMAB reagent (1.6 g DMAB+90 mL ethanol + 10 mL concentrate HCL) in a cubate and spectrophotometer reading was taken at 425 nm and recorded.The daily milk yield of individual cow was recorded and milk samples were collected in every day. Samples were preserved at -20⁰C and carried out and analyzed for fat, protein, lactose, solid not fat (SNF) and minerals in Dairy Science Laboratory of Animal Production Research Division, Bangladesh Livestock Research Institution, Savar, Dhaka using a Milk Analyzer. Samples were analyzed for ‘milk urea nitrogen (MUN) con- tent of milk using a colorimetric dimethyl amino benzal- dehyde method as described by some studies. Spectrophotometer absorbance is taken at 425 nm. Data were analyzed in a 2 × 2 factorial experiment in a completely randomized block design using a computer package GENSTAT to determine the effects of breed on MUN and its relations with the quality of diets and milk.

Source of Information: Iranian Journal of Applied Animal Science (2015) 5(2), 279-283

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Milk urea nitrogen is an important tool to know the nutritional status of dairy cattle. Higher milk urea nitrogen means body condition of the animal is good. In such case, the protein percentage should be decreased in ration formulation. the reverse to be done if found other way round. Knowing Milk urea nitrogen concentration, the farmers could make exact ration formulation.

Knowledge Management: Journal