The heritability of milk yield and fat percentage in the Friesian cattle in the province of Friesland

S.A.F. El-Shimy

Research output: Thesisinternal PhD, WU

Abstract

The heritability of milk yield and fat percentage was calculated of herd-registered cattle in Friesland. The estimates were based on daughter-dam comparisons. Comparisons covered the first three lactations. The average heritability estimates of milk yield within sires, and according to the different kinds of soil, were 35.50 and 37.38 %, with daughter-dam regression and dam-daughter correlation, respectively. Under the same conditions the figures for fat percentage were 76.52 and 81.58 %, respectively.

When the effect of different soils was ignored, average heritability estimates for milk were 36.58 and 38.60 %, respectively. The corresponding figures for fat percentage were 76.40 and 81.60 %, respectively.

If the figures were not calculated on within-sire basis, the average heritability for milk yield was 39.60 and 40.60 %; whereas for fat percentage the estimates were 84.44 and 83.52 %, as calculated from daughter-dam regression, and damdaughter correlation, respectively.

The most reliable estimates of heritability were by the within-sire daughterdam regression calculated for each of the different soil types.

Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Wageningen University
Supervisors/Advisors
  • de Jong, W., Promotor, External person
Award date23 Mar 1956
Place of Publication's-Gravenhage
Publisher
Publication statusPublished - 1956
Externally publishedYes

Fingerprint

dams (hydrology)
milk fat
milk yield
heritability
cattle
sires
lipids
soil types
soil
lactation
herds
milk

Keywords

  • genetics
  • heritability
  • genetic variation
  • cattle
  • raw milk
  • dairy breeds
  • productivity
  • profitability
  • animal husbandry
  • animal products
  • chemical composition
  • ingredients
  • netherlands
  • friesland

Cite this

@phdthesis{14cae9bfbf214eff9059b3a637df5fae,
title = "The heritability of milk yield and fat percentage in the Friesian cattle in the province of Friesland",
abstract = "The heritability of milk yield and fat percentage was calculated of herd-registered cattle in Friesland. The estimates were based on daughter-dam comparisons. Comparisons covered the first three lactations. The average heritability estimates of milk yield within sires, and according to the different kinds of soil, were 35.50 and 37.38 {\%}, with daughter-dam regression and dam-daughter correlation, respectively. Under the same conditions the figures for fat percentage were 76.52 and 81.58 {\%}, respectively.When the effect of different soils was ignored, average heritability estimates for milk were 36.58 and 38.60 {\%}, respectively. The corresponding figures for fat percentage were 76.40 and 81.60 {\%}, respectively.If the figures were not calculated on within-sire basis, the average heritability for milk yield was 39.60 and 40.60 {\%}; whereas for fat percentage the estimates were 84.44 and 83.52 {\%}, as calculated from daughter-dam regression, and damdaughter correlation, respectively.The most reliable estimates of heritability were by the within-sire daughterdam regression calculated for each of the different soil types.",
keywords = "genetica, heritability, genetische variatie, rundvee, rauwe melk, melkveerassen, productiviteit, rentabiliteit, dierhouderij, dierlijke producten, chemische samenstelling, ingredi{\"e}nten, nederland, friesland, genetics, heritability, genetic variation, cattle, raw milk, dairy breeds, productivity, profitability, animal husbandry, animal products, chemical composition, ingredients, netherlands, friesland",
author = "S.A.F. El-Shimy",
note = "WU thesis 202 Proefschrift Wageningen",
year = "1956",
language = "English",
publisher = "Excelsior",
school = "Wageningen University",

}

El-Shimy, SAF 1956, 'The heritability of milk yield and fat percentage in the Friesian cattle in the province of Friesland', Doctor of Philosophy, Wageningen University, 's-Gravenhage.

The heritability of milk yield and fat percentage in the Friesian cattle in the province of Friesland. / El-Shimy, S.A.F.

's-Gravenhage : Excelsior, 1956. 75 p.

Research output: Thesisinternal PhD, WU

TY - THES

T1 - The heritability of milk yield and fat percentage in the Friesian cattle in the province of Friesland

AU - El-Shimy, S.A.F.

N1 - WU thesis 202 Proefschrift Wageningen

PY - 1956

Y1 - 1956

N2 - The heritability of milk yield and fat percentage was calculated of herd-registered cattle in Friesland. The estimates were based on daughter-dam comparisons. Comparisons covered the first three lactations. The average heritability estimates of milk yield within sires, and according to the different kinds of soil, were 35.50 and 37.38 %, with daughter-dam regression and dam-daughter correlation, respectively. Under the same conditions the figures for fat percentage were 76.52 and 81.58 %, respectively.When the effect of different soils was ignored, average heritability estimates for milk were 36.58 and 38.60 %, respectively. The corresponding figures for fat percentage were 76.40 and 81.60 %, respectively.If the figures were not calculated on within-sire basis, the average heritability for milk yield was 39.60 and 40.60 %; whereas for fat percentage the estimates were 84.44 and 83.52 %, as calculated from daughter-dam regression, and damdaughter correlation, respectively.The most reliable estimates of heritability were by the within-sire daughterdam regression calculated for each of the different soil types.

AB - The heritability of milk yield and fat percentage was calculated of herd-registered cattle in Friesland. The estimates were based on daughter-dam comparisons. Comparisons covered the first three lactations. The average heritability estimates of milk yield within sires, and according to the different kinds of soil, were 35.50 and 37.38 %, with daughter-dam regression and dam-daughter correlation, respectively. Under the same conditions the figures for fat percentage were 76.52 and 81.58 %, respectively.When the effect of different soils was ignored, average heritability estimates for milk were 36.58 and 38.60 %, respectively. The corresponding figures for fat percentage were 76.40 and 81.60 %, respectively.If the figures were not calculated on within-sire basis, the average heritability for milk yield was 39.60 and 40.60 %; whereas for fat percentage the estimates were 84.44 and 83.52 %, as calculated from daughter-dam regression, and damdaughter correlation, respectively.The most reliable estimates of heritability were by the within-sire daughterdam regression calculated for each of the different soil types.

KW - genetica

KW - heritability

KW - genetische variatie

KW - rundvee

KW - rauwe melk

KW - melkveerassen

KW - productiviteit

KW - rentabiliteit

KW - dierhouderij

KW - dierlijke producten

KW - chemische samenstelling

KW - ingrediënten

KW - nederland

KW - friesland

KW - genetics

KW - heritability

KW - genetic variation

KW - cattle

KW - raw milk

KW - dairy breeds

KW - productivity

KW - profitability

KW - animal husbandry

KW - animal products

KW - chemical composition

KW - ingredients

KW - netherlands

KW - friesland

M3 - internal PhD, WU

PB - Excelsior

CY - 's-Gravenhage

ER -