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Bergfors, Anna (2006) Hackelselängdens betydelse för tuggtid och foderkonsumtion hos mjölkkor. Other thesis, SLU.

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Today, our cows experience a harder pressure to achieve higher milk yield. To manage this challenge the animal needs first class feeding and treatment. An important aspect of the feeding is to fulfil the need from the cows of especially fiber; and fiber with a sufficient proportion of long particles. Both too much and too little fiber is bad for the wellbeing of the cow, and she might get diseases like acidosis. Many models for feed management have been developed to secure that the animal gets enough of e.g. fiber with a sufficient proportion of long particles. The models describing physical characteristics of NDF have primarily been used in research. However, the new feed evaluating system NORFOR Plan will use the parameter "total chewing time" to secure the value of fiber with sufficient proportion of long particles. Total chewing time is the sum of the eating time and the ruminating time and is measured as minutes per kg dry matter. The aim of my study was to investigate how the physical characteristics of fiber affects the eating behaviour and total chewing time. In the study total chewing time was compared in two silages with similar nutrient composition. The only differences between the two silages were different chopping lengths. Twenty SRB cows in robotic milking (VMS system) was included in the study. They were randomly divided into two groups and feed with the two different silages. The length of the silage harvested with the self load wagon was 58 mm and the length of the silage harvested with the precession chopper was 25 mm arithmetic mean. The total chewing time was measured during at least 23 hours, using an IGER behaviour recorder (Ultrasound advice, London, U.K.). The jaw moment amplitude data were recorded at 20 Hz. Data files were analyzed in software GRAZE version 1,0 (Ultrasound advice, London, U.K.). Bouts of jaw moments were classified as either eating or ruminating. The result of my study implicates that the cows being feed with the longer silage had a tendency for longer total chewing time than the cows feed the precision chopped silage. An observation was that the cows fed with the shorter chopped silage consumed slightly more feed, but no significant differences in total feed consumption between the two groups could be observed.

Item Type: Thesis (Other)
Keywords: fysisk struktur, fibrer, strukturanalys, bildanalys,
Subject (faculty): Faculty of Veterinary Medicine and Animal Science > Centre for Sustainable Agriculture
Divisions: SLU > Faculty of Veterinary Medicine and Animal Science
Depositing User: Jan Bertilsson
Date Deposited: 17 Jan 2007
Last Modified: 18 Aug 2015 09:47
URI: http://ex-epsilon.slu.se/id/eprint/1430

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