The inheritance of protein content in the milk of dairy cows
dc.contributor.author
Zein-el-dine, S.
en
dc.date.accessioned
2019-02-15T14:28:20Z
dc.date.available
2019-02-15T14:28:20Z
dc.date.issued
1939
dc.description.abstract
en
dc.description.abstract
Details are given of the protein and casein
yields during the complete lactation of healthy cows
maintained under conditions of reasonably uniform
management at the experimental farms of the Institute
of Animal Genetics.
en
dc.description.abstract
Methods of chemical analysis are stated in
detail, with especial reference to the precipitation
of the casein at its isoelectric point. The
standard errors involved in the chemical work were
determined experimentally and two methods for precipitating
the casein were compared without finding
a substantial difference.
en
dc.description.abstract
An examination is made of the effect of various
'environmental conditions on the secretion of protein.
Age of the cow was found to have a definite effect
on the amount of protein secreted; it was found to
increase with age. Service period also affects the
amount, the longer the S.P. the bigger the amount of
protein. Cows calving in October and November give
the highest yields and those calving in March and
April give the lowest. A dry period preceding the
lactation has no effect if it exceeds three weeks.
en
dc.description.abstract
Statistical methods used at present to investigate
the problems of inheritance of the milk yield
and its constituents are discussed in detail. The
squared difference method is employed and certain
difficulties in its application are noted, requiring
an adjustment of one of the raw figures to compensate
for the fact that one relationship group is unduly
dominated by the progeny of a single bull.
en
dc.description.abstract
The results show that the amounts of protein and
casein secreted during lactation are inherited. The
effect of the sire was found to be equal to that of
the dam in the transmission of the genes governing the
inheritance of these two characters. The mean square
difference between the yields of unrelated cows was
greater than the mean square difference between the
yields of any other relationship group. The mean
square difference between the yields of dam and
daughter was also found. Arising from this study
certain correlations between the protein yield of
related cows are included.
en
dc.identifier.uri
http://hdl.handle.net/1842/34561
dc.publisher
The University of Edinburgh
en
dc.relation.ispartof
Annexe Thesis Digitisation Project 2019 Block 22
en
dc.relation.isreferencedby
en
dc.title
The inheritance of protein content in the milk of dairy cows
en
dc.type
Thesis or Dissertation
en
dc.type.qualificationlevel
Doctoral
en
dc.type.qualificationname
PhD Doctor of Philosophy
en
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