dc.contributor.author
Wappler, Olaf
dc.date.accessioned
2018-06-08T00:05:09Z
dc.date.available
2000-12-14T00:00:00.649Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/11435
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-15633
dc.description
Die komplette Dissertation im pdf-Format (462.840 Bytes):
wappl.pdf
dc.description.abstract
In two experiments on a total of 95 cows (25 Holstein-Friesian, 64
Schwarzbuntes Milchrind) tests were made to determine the urea space 12
minutes after intravenous administration of a defined amount of urea (HVR12),
live weight and dorsal fat thickness, also to determine the body fat content
investigated by the estimation of total body water with antipyrine. Further to
this followed tests of smiliar nature between visuell respectively palpatorial
estimated and measured dorsal fat thickness. The results of the tests were
analysed dependent on tests of: number of lactation, state of lactation,
breed, day of weighing and condition.
The HVR12 is unsuitable for estimation of body fat content of dairy cows.
There is no connection between the absolute body fat content and the absolute
HVR12. Between the relative body fat content and the relative HVR12 combined
with r2 = 0,12 a low significant measure of accuracy is established.
The statement of the live weight compared with body fat content is limited.
Between the absolute respectively relative body fat content and the live
weight combined with r2 = 0, 34 and r2 = 0,16 significant relationships are
established. With animals of the 1st and 2nd lactation, also the early and
middle lactation, the live weight is unsuitable as a parameter to judge the
body fat content. With cows of the 3 rd lacatation and late lactating cows the
force of evidence rises increasingly. Compared to HVR12, the live weight is
more suitable to estimate the body fat content.
The dorsal fat thickness has a direct relationship to the body fat content. Of
all three parameters the dorsal fat thickness supplies the best evidence. A
significant connection of r2 = 0,62 and r2 = 0,58 can be found between the
absolute respectively relative body fat content and the dorsal fat thickness.
With increasing number of lactation and length of advanced lactation the force
of evidence of dorsal fat thickness will increase in relation to the body fat
content. Compared with the live weight, dorsal fat thickness permits cows of
the 1st and 2nd lactation as well as early lactating animals a positive
judgement of the body condition.
The utilization of multiple regresion models promisses - compared with single
parameters -no substantial improvement of evidence regarding the body fat
content, except the dorsal fat thickness combined with the live weight as
opposed to the dorsal fat thickness as a single parameter, a slightly improved
accuracy of r2 = 0,62 to r2 = 0,69 is achieved.
A certain agreement exists between, throuh extrapolation inveastigated urea
space (61,7 %) and the total body water (61,1 %), also the therefrom
calculated body fat content. The calculation of the body fat content relating
to the extrapolated urea space achieves no improvement with reference to the
time and expenditure of work in comparison with the standard method with
antipyrine.
Between the visuell respectively palpatorial estimated and mesured dorsal fat
thickness a highly significant accuracy (r2 = 0,85) is established. Soon after
a short training period it is possible to estimate the dorsal fat thickness of
dairy cows with sufficiant accuracy. Attention must be payed to negative
influence of the estimation accuracy, depending on the condition of the cows.
Badly conditioned cows with a dorsal fat thickness <= 10 mm would be
overrated, well and very well conditioned cows with a dorsal fat thickness
more than 24 mm would be underestimated. To ensure an acceptable estimation of
accuracy, the supplementary measure of control is therefore a special
significance regarding very lean and very fat cows.
en
dc.rights.uri
http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen
dc.subject.ddc
600 Technik, Medizin, angewandte Wissenschaften::630 Landwirtschaft::630 Landwirtschaft und verwandte Bereiche
dc.title
Vergleichende Untersuchungen zur Aussage des Harnstoffverteilungsraumes, der
Lebendmasse und der Rückenfettdicke zum Körperfettgehalt der Milchkuh
dc.contributor.firstReferee
Univ.-Prof. Dr. R. Staufenbiel
dc.contributor.furtherReferee
Univ.-Prof. Dr. H. Hartmann
dc.date.accepted
1997-07-08
dc.date.embargoEnd
2001-01-23
dc.identifier.urn
urn:nbn:de:kobv:188-1998000981
dc.title.translated
Comparing tests on the subject of urea space, live weight and dorsal fat
thickness to the body fat content of dairy cows
en
refubium.affiliation
Veterinärmedizin
de
refubium.mycore.fudocsId
FUDISS_thesis_000000000089
refubium.mycore.transfer
http://www.diss.fu-berlin.de/1998/98/
refubium.mycore.derivateId
FUDISS_derivate_000000000089
dcterms.accessRights.dnb
free
dcterms.accessRights.openaire
open access