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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Leite; Embrapa Pantanal. |
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Data corrente: |
05/08/1992 |
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Data da última atualização: |
19/07/2018 |
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Autoria: |
TEIXEIRA, N. M. |
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Título: |
Genetic differences in dystocia, calf condition and calf livability in Holsteins. |
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Ano de publicação: |
1978 |
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Fonte/Imprenta: |
Ames: Iowa State University, 1978. |
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Páginas: |
104p. |
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Idioma: |
Inglês |
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Notas: |
Ph.D. Dissertation. |
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Conteúdo: |
Records on approximately 13,000 births during the period 1972-1976, from Select Sires, Inc., were used in the present study. Beginning in 1974, 1518 records for which both sire and maternal grandsire could be identified were available. The main objective was to obtain sire stimates for calving difficulty of their daughters and for condition and livability of the calf at birth using variations of mixed model techniques. Variations in model definitions were in the use of relationships among sires and in the sire fitted in the model. The calving reports by herdsmen contained identification of the herd, breeding and calving dates, age and size-of-dam, sex and size-of-calf, sire, and codes for calving difficulty, condition and livability of the calf. Calving difficulty was coded as: 1 - no problem, 2 - slight problem, 3 - needed assistance, 4 - considerable force needed, and 5 - extreme difficulty. Codes for condition and livability of the calf ranged from 1 to 3. Age-of-dam was recorded by parities. A preliminary analysis provided some information on the frequency of calving problems in the data. Eighteen percent of all cows had some degree of difficulty on giving birth, 16% being cases where considerable force was needed. The incidence of deformed calves varied from 2 to 7 per thousand births. Approximately 5% of the calves were dead. Condition and livability of the calf were analyzed as all-or-none traits. Weak and deformed calves were given a score of zero and the normal a score of one. Also, dead calves were... MenosRecords on approximately 13,000 births during the period 1972-1976, from Select Sires, Inc., were used in the present study. Beginning in 1974, 1518 records for which both sire and maternal grandsire could be identified were available. The main objective was to obtain sire stimates for calving difficulty of their daughters and for condition and livability of the calf at birth using variations of mixed model techniques. Variations in model definitions were in the use of relationships among sires and in the sire fitted in the model. The calving reports by herdsmen contained identification of the herd, breeding and calving dates, age and size-of-dam, sex and size-of-calf, sire, and codes for calving difficulty, condition and livability of the calf. Calving difficulty was coded as: 1 - no problem, 2 - slight problem, 3 - needed assistance, 4 - considerable force needed, and 5 - extreme difficulty. Codes for condition and livability of the calf ranged from 1 to 3. Age-of-dam was recorded by parities. A preliminary analysis provided some information on the frequency of calving problems in the data. Eighteen percent of all cows had some degree of difficulty on giving birth, 16% being cases where considerable force was needed. The incidence of deformed calves varied from 2 to 7 per thousand births. Approximately 5% of the calves were dead. Condition and livability of the calf were analyzed as all-or-none traits. Weak and deformed calves were given a score of zero and the normal a sc... Mostrar Tudo |
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Palavras-Chave: |
Bovinos; Calf; Genetic; Heritabilidade; Raca holandesa. |
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Thesagro: |
Bezerro; Criação; Genética; Parto; Reprodução Animal; Variação Genética. |
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Thesaurus Nal: |
animal breeding; dystocia; heritability; reproduction. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02330nam a2200313 a 4500
001 1790534
005 2018-07-19
008 1978 bl uuuu m 00u1 u #d
100 1 $aTEIXEIRA, N. M.
245 $aGenetic differences in dystocia, calf condition and calf livability in Holsteins.
260 $aAmes: Iowa State University$c1978
300 $a104p.
500 $aPh.D. Dissertation.
520 $aRecords on approximately 13,000 births during the period 1972-1976, from Select Sires, Inc., were used in the present study. Beginning in 1974, 1518 records for which both sire and maternal grandsire could be identified were available. The main objective was to obtain sire stimates for calving difficulty of their daughters and for condition and livability of the calf at birth using variations of mixed model techniques. Variations in model definitions were in the use of relationships among sires and in the sire fitted in the model. The calving reports by herdsmen contained identification of the herd, breeding and calving dates, age and size-of-dam, sex and size-of-calf, sire, and codes for calving difficulty, condition and livability of the calf. Calving difficulty was coded as: 1 - no problem, 2 - slight problem, 3 - needed assistance, 4 - considerable force needed, and 5 - extreme difficulty. Codes for condition and livability of the calf ranged from 1 to 3. Age-of-dam was recorded by parities. A preliminary analysis provided some information on the frequency of calving problems in the data. Eighteen percent of all cows had some degree of difficulty on giving birth, 16% being cases where considerable force was needed. The incidence of deformed calves varied from 2 to 7 per thousand births. Approximately 5% of the calves were dead. Condition and livability of the calf were analyzed as all-or-none traits. Weak and deformed calves were given a score of zero and the normal a score of one. Also, dead calves were...
650 $aanimal breeding
650 $adystocia
650 $aheritability
650 $areproduction
650 $aBezerro
650 $aCriação
650 $aGenética
650 $aParto
650 $aReprodução Animal
650 $aVariação Genética
653 $aBovinos
653 $aCalf
653 $aGenetic
653 $aHeritabilidade
653 $aRaca holandesa
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Registro original: |
Embrapa Pantanal (CPAP) |
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| Registros recuperados : 35 | |
| 16. |  | DURAES, M. C.; FREITAS, A. F.; TEIXEIRA, N. M.; VALENTE, J.; MARTINEZ, M. L. Fatores de ajustamento para a produção de leite e gordura na raça Holandesa para rebanhos do Estado de Minas Gerais. Revista Brasileira de Zootecnia, Viçosa, MG, v. 28, n. 6, p. 1231-1238, 1999.| Biblioteca(s): Embrapa Gado de Leite. |
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| Registros recuperados : 35 | |
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