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Asaisonalität bei Bergschafen*.

C Mendel1, F Pirchner

  • 1Institut für Tierwissenschaften, TU München, Freising-Weihenstephan, Deutschland.

Journal of Animal Breeding and Genetics = Zeitschrift Fur Tierzuchtung Und Zuchtungsbiologie
|March 15, 2011
PubMed
Summary
This summary is machine-generated.

Bergschaf breeds exhibit greater aseasonality than Merinos, leading to shorter lambing intervals and more uniform lambing distribution. This trait is influenced by environmental factors and genetics, with heritability for age at first lambing around 0.6.

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Area of Science:

  • Animal Science
  • Reproductive Biology
  • Quantitative Genetics

Background:

  • The Tyrolean Bergschaf (TB) and Weiße Bergschaf (WB) are important sheep breeds.
  • Understanding their reproductive seasonality is crucial for efficient sheep farming.

Purpose of the Study:

  • To analyze age at first lambing (ELA) and lambing interval (ZLZ) in TB and WB breeds.
  • To compare the aseasonality of Bergschaf with German Merino Landschafe.
  • To investigate factors influencing reproductive traits and cyclicity in Bergschaf.

Main Methods:

  • Analysis of 9849 TB and 1448 WB records for ELA and ZLZ.
  • Comparison with 125 German Merino Landschaf records.
  • Study of cyclicity in 26 WB using progesterone levels and ram response.
  • Statistical analysis of environmental and genetic influences.

Main Results:

  • ELA averaged 490 days and ZLZ approximately 240 days for TB and WB, with minor differences between them.
  • Year, season, parity, and farm significantly impacted reproductive traits.
  • Bergschaf demonstrated greater aseasonality than Merinos, with a 35-day shorter ZLZ.
  • Heritability for ELA was estimated at 0.6, while repeatability for ZLZ was around 0.2.
  • Sexual maturity occurred at ~9.5 months and 43 kg; the ovulatory period extended from late April to January.

Conclusions:

  • Bergschaf breeds are significantly more aseasonal than German Merino Landschafe.
  • Environmental factors and genetics play a role in reproductive seasonality.
  • Management practices, such as avoiding summer lambing on certain pastures, can favorably influence aseasonality.