Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.768980
Title: Factors that influence dairy cow preference to be indoors or at pasture
Author: Motupalli, Priya
ISNI:       0000 0004 7656 1437
Awarding Body: Harper Adams University
Current Institution: Harper Adams University
Date of Award: 2014
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Abstract:
Many factors influence dairy cow preference to be at pasture. The studies reported here investigated whether herbage mass and previous experience affected preference. The first study offered a high (3000 ± 200 kg DM) vs. low (1800 ± 200 kg DM) mass at a near (38 m) vs. far (254 m) distance to 16 Holstein-Friesian dairy cows. Masses were offered at two distances to determine motivation. A continuously housed control group (n =16) was also compared to cows with free access to pasture. Video recordings and scan-sampling with five-minute intervals revealed that mass did not affect preference (P > 0.05), but the proportion of time cows spent at pasture during the day was more at the near distance (73.7% vs. 28.8%, P < 0.05). Night-time pasture use was not affected by distance. Continuously housed cows produced 6.7 kg less milk/day than free-access cows (P < 0.05). To determine the effect of previous experience, two groups of 12 Holstein-Friesian dairy heifers were reared with or without exposure to pasture and tested for their preference for pasture at 16 months in 2012. In 2013, when lactating, a similar study was conducted with the same treatment groups in addition to a group that was reared without exposure in their first grazing season, but with exposure in their second grazing season. Indoor-reared heifers spent more time indoors (82.6 vs. 55.6%, P < 0.05), and investigating grass (5.07% vs. 2.39%, P < 0.05) than heifers with experience of pasture. As the measurement period progressed, indoor-reared heifers spent more time at pasture (P < 0.05). Similar results were reported for lactating cows, but no effect of time was recorded for cows without exposure to pasture (P > 0.05). The original findings of this thesis show that herbage mass does not affect high yielding dairy cow preference for pasture, but pasture access can have a beneficial effect on production. Dairy cattle without experience of pasture show a decreased preference for it, but depending on age of exposure this changes over time.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.768980  DOI: Not available
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