Factors affecting litter size in Texel sheep

M.A. Sharafeldin

doi:10.18174/183364

Factors affecting litter size in Texel sheep

M.A. Sharafeldin

Research output: Thesis › internal PhD, WU

Abstract

The effect of age of ewes and of different lambing years on fertility expressed as number of lambs born and surviving to 2 months per lambing has been studied in field data collected by the herdbook for Texel sheep in North Holland. The fertility of ewes was compared when first bred at about 8 months or at about 20 months of age and the effect of heredity on litter size was studied.

Hereditary effects were determined by the effect of type of birth of sire, dam and ewe on the fertility of ewes, by heritability of litter size, by the effect of sires on fertility of these female progeny and estimating the repeatability of litter size. Effect of age of ewe on fertility was studied.

Original language	English
Qualification	Doctor of Philosophy
Awarding Institution
Supervisors/Advisors	Stegenga, T., Promotor, External person
Award date	1 Apr 1960
Place of Publication	Wageningen
Publisher	Veenman
DOIs	https://doi.org/10.18174/183364
Publication status	Published - 1 Apr 1960

Keywords

texel

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10.18174/183364

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title = "Factors affecting litter size in Texel sheep",

abstract = "The effect of age of ewes and of different lambing years on fertility expressed as number of lambs born and surviving to 2 months per lambing has been studied in field data collected by the herdbook for Texel sheep in North Holland. The fertility of ewes was compared when first bred at about 8 months or at about 20 months of age and the effect of heredity on litter size was studied.Hereditary effects were determined by the effect of type of birth of sire, dam and ewe on the fertility of ewes, by heritability of litter size, by the effect of sires on fertility of these female progeny and estimating the repeatability of litter size. Effect of age of ewe on fertility was studied.",

keywords = "texelaar, texel",

author = "M.A. Sharafeldin",

note = "WU thesis 277 Proefschrift Wageningen",

year = "1960",

month = apr,

day = "1",

doi = "10.18174/183364",

language = "English",

publisher = "Veenman",

address = "Netherlands",

type = "internal PhD, WU",

}

TY - THES

T1 - Factors affecting litter size in Texel sheep

AU - Sharafeldin, M.A.

N1 - WU thesis 277 Proefschrift Wageningen

PY - 1960/4/1

Y1 - 1960/4/1

N2 - The effect of age of ewes and of different lambing years on fertility expressed as number of lambs born and surviving to 2 months per lambing has been studied in field data collected by the herdbook for Texel sheep in North Holland. The fertility of ewes was compared when first bred at about 8 months or at about 20 months of age and the effect of heredity on litter size was studied.Hereditary effects were determined by the effect of type of birth of sire, dam and ewe on the fertility of ewes, by heritability of litter size, by the effect of sires on fertility of these female progeny and estimating the repeatability of litter size. Effect of age of ewe on fertility was studied.

AB - The effect of age of ewes and of different lambing years on fertility expressed as number of lambs born and surviving to 2 months per lambing has been studied in field data collected by the herdbook for Texel sheep in North Holland. The fertility of ewes was compared when first bred at about 8 months or at about 20 months of age and the effect of heredity on litter size was studied.Hereditary effects were determined by the effect of type of birth of sire, dam and ewe on the fertility of ewes, by heritability of litter size, by the effect of sires on fertility of these female progeny and estimating the repeatability of litter size. Effect of age of ewe on fertility was studied.

KW - texelaar

KW - texel

UR - https://edepot.wur.nl/183364

U2 - 10.18174/183364

DO - 10.18174/183364

M3 - internal PhD, WU

PB - Veenman

CY - Wageningen

ER -

Factors affecting litter size in Texel sheep

Abstract

Keywords

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