Effect of supplementation of beta-carotene enriched mineral-vitamin premix on performance of lactating crossbred Sahiwal cows.
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Date
2021
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Department of Dairy Science and Food Technology Institute of Agricultural Sciences Banaras, Hindu University Varanasi
Abstract
The present research was carried out in the Department of Dairy Science and Food Technology, Institute of Agricultural Sciences, BHU, Varanasi. In this experiment Twenty-four disease-free lactating crossbred Sahiwal cows with a close date of calving were randomly divided into two homogeneous groups for control group (CONT; n=12) and beta-carotene group: 500 mg/cow/d (BETA; n=12) from 7 days post partum (dpp) until 105 dpp.Statistically analyzed data revealed that post partum fortnightly milk yield significantly (P0.001), but only post partum fortnightly lactose percent was higher (P0.001) to increase body weight, dry matter intake and digestibility of crude protein, crude fiber, nitrogen free-extract, ether extract and intake of total digestible nutrients. Overall yields of total milk yield, fat-corrected milk 3.5%, energy-corrected milk, milk fat, milk protein, milk lactose, milk solid not fat yield and milk solid matter did not differ between cows in CONT and BETA groups. Post partum udder health status fortnightly from 45 to 105 days experimental period was observed (P<0.001) lower somatic cell counts (SCC) of raw milk from 12.50 to 10.02 log104 cells/ml of raw milk in BETA-group cows when compare with CONT-group cows continually higher SCC of raw milk from 12.69 to 13.17 log104 cells/ml of raw milk and Modified California Mastitis tests (MCMT) from 45 to 105 dpp were recorded (P<0.001) lower grades in the BETA-group cows (2.27 to 1.35 ) than that in CONT-group cows regularly higher grades (3.59 to 3.96) recorded. The post partum fortnightly test of methylene blue reduction (MBRT) from 45 to 105 dpp was found (P<0.001) very good quality of raw milk in BETA-group cows (107.96 to 139.89 in minutes) compare to the CONT-group cows (90.81 to 80.78 in minutes) throughout post partum period.Beta-carotene concentrations increased in plasma of BETA-group cows compared to CONT-group cows (P<0.001). In BETA-group cows, urea concentration in plasma decreased significantly compared to cows of CONT-group (P<0.001), but did not differ in total protein, albumin, glucose and total cholesterol content in cows of both groups. Occurrence of first post partumestrus decreased (P<0.001) in beta-carotene (BETA-group: 74 dpp) cows compared to control (CONT-group: 81 dpp) cows. In this study, it was observed that the overall conception rate was higher (P<0.001) in BETA-group: 83.33% (cows pregnant: 10/12) and lesser in the CONT-group: 50.00% (cows pregnant: 6/12).
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Beta-carotene