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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
21/01/2016 |
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Data da última atualização: |
21/01/2016 |
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Autoria: |
SINGH, R. N.; ACHARYA, R. M. A. |
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Título: |
Improvement through selection for milk in a closed flock of Beetal goats. |
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Ano de publicação: |
1982 |
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Fonte/Imprenta: |
In: INTERNATIONAL CONFERENCE ON GOAT PRODUCTION AND DISEASE, 3., 1982, Tucson. Proceedings... Scottsdale: Dairy Goat Journal, 1982. p. 305 |
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ISBN: |
0930848179 |
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Idioma: |
Inglês |
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Conteúdo: |
Data on 1436 Beetal nannies, progeny of 103 sires, and spread over 37 years were analyzed to obtain phenotypic and genetic parameters of age at first kidding (AFK), first lactation milk yield (FLY), first lactation length (FLL) and first kidding interval (FKI) and lifetime production combining first three lactations (LTP), independent of the effect of year and season of kidding. For these traits least square means were 776 days, 130.1 kg, 174 days, 382 days and 559 kg and heritability estimates were 0.15, 0.29, 0.04, 0.13 and 0.30, respectively. Genetically, LTP had large and negative correlations with AFK, FLL and FKI and a large positive correlation with FLY. Phenotypically the correlations of LTP were positive but extremely low with AFK, large and positive with FLY and FLL and negative and extremely low with FKI. Selection indices combining AFK, FLY, FLL and FKI to maximise genetic gains in LTP were constructed. Although the index incorporating all the four traits had the maximum correlation (R equal 0.69) with breeding values for LTP and will bring maximum genetic gain ( GLTP equal 29 kg), the index (I equal 0.39 FLY - 0.22 FLL - 0.09 FKI) will be only slightly less efficient (R equal 0.65 and GLTP equal 27 kg) and is recommended |
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Thesagro: |
Analise estatistica; Caprino; Genética animal; Melhoramento genético animal; Produção animal. |
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Thesaurus Nal: |
Animal genetics; Animal production; Goats; India; Statistical analysis. |
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Categoria do assunto: |
G Melhoramento Genético |
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Marc: |
LEADER 02068naa a2200265 a 4500
001 2034630
005 2016-01-21
008 1982 bl uuuu u00u1 u #d
020 $a0930848179
100 1 $aSINGH, R. N.
245 $aImprovement through selection for milk in a closed flock of Beetal goats.
260 $c1982
520 $aData on 1436 Beetal nannies, progeny of 103 sires, and spread over 37 years were analyzed to obtain phenotypic and genetic parameters of age at first kidding (AFK), first lactation milk yield (FLY), first lactation length (FLL) and first kidding interval (FKI) and lifetime production combining first three lactations (LTP), independent of the effect of year and season of kidding. For these traits least square means were 776 days, 130.1 kg, 174 days, 382 days and 559 kg and heritability estimates were 0.15, 0.29, 0.04, 0.13 and 0.30, respectively. Genetically, LTP had large and negative correlations with AFK, FLL and FKI and a large positive correlation with FLY. Phenotypically the correlations of LTP were positive but extremely low with AFK, large and positive with FLY and FLL and negative and extremely low with FKI. Selection indices combining AFK, FLY, FLL and FKI to maximise genetic gains in LTP were constructed. Although the index incorporating all the four traits had the maximum correlation (R equal 0.69) with breeding values for LTP and will bring maximum genetic gain ( GLTP equal 29 kg), the index (I equal 0.39 FLY - 0.22 FLL - 0.09 FKI) will be only slightly less efficient (R equal 0.65 and GLTP equal 27 kg) and is recommended
650 $aAnimal genetics
650 $aAnimal production
650 $aGoats
650 $aIndia
650 $aStatistical analysis
650 $aAnalise estatistica
650 $aCaprino
650 $aGenética animal
650 $aMelhoramento genético animal
650 $aProdução animal
700 1 $aACHARYA, R. M. A.
773 $tIn: INTERNATIONAL CONFERENCE ON GOAT PRODUCTION AND DISEASE, 3., 1982, Tucson. Proceedings... Scottsdale: Dairy Goat Journal, 1982. p. 305
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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