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Impact of dietary transition at dry off on the behavior and physiology of dairy cows

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dc.contributor.advisor DeVries, Trevor
dc.contributor.author Dancy, Kaitlyn
dc.date.accessioned 2018-06-06T18:23:23Z
dc.date.available 2018-06-06T18:23:23Z
dc.date.copyright 2018-04
dc.date.created 2018-05-22
dc.date.issued 2018-06-06
dc.identifier.uri http://hdl.handle.net/10214/13533
dc.description.abstract This thesis, firstly, investigated the impact of dietary transition at dry off on the behavior and physiology of Holstein dairy cows, and secondly, evaluated the efficacy of utilizing reductions in dietary nutrient density and milking frequency to mediate the dry off process and promote cow welfare. From the start of a 5-d dry off, wherein cows were milked intermittently, until 3 wk dry, cows received 1 of 2 dry cow total mixed rations which differed in nutrient density. Cows fed the dry cow diet of lower nutrient density had lower milk production at the time of dry off compared with cows fed the diet of higher nutrient density, likely as a result of dry matter intake being limited in cows fed the former, due to greater fill of the rumen. Cows fed the lower nutrient density diet fed at a slower rate, spent more time feeding, and sorted to a greater extent for the smaller, more nutrient dense components of the diet compared with cows fed the higher nutrient density diet. Regardless of sorting activity, cows fed the lower nutrient density diet spent more time ruminating per unit of dry matter consumed and had higher reticulorumen pH. Dietary transition and dry off similarly affected the energy balance and inflammatory response of cows. The results of this study indicate that the lower nutrient density diet more effectively reduced milk production before dry off, while not negatively impacting cow behavior and physiology. en_US
dc.language.iso en en_US
dc.subject dry off en_US
dc.subject dietary transition en_US
dc.subject dairy cow en_US
dc.title Impact of dietary transition at dry off on the behavior and physiology of dairy cows en_US
dc.type Thesis en_US
dc.degree.programme Animal and Poultry Science en_US
dc.degree.name Master of Science en_US
dc.degree.department Department of Animal Biosciences en_US
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