2002
DOI: 10.1590/s1516-35982002000400023
|View full text |Cite
|
Sign up to set email alerts
|

Abstract: Um modelo estático determinístico, com base em resultados de pesquisas, avaliou por intermédio de simulações, a produtividade e a eficiência biológica de sistemas de ciclo completo de produção de bovinos de corte no Rio Grande do Sul, diferindo na idade das novilhas no primeiro parto (IP, meses) e dos novilhos ao abate (IA, meses): "Sistema Tradicional" (ST) IP48, IA54; "Sistema Melhorado" (SM), IP36, com duas idades de abate, IA36 (SM-I) e IA24 (SM-II); "Sistema Um Ano" (SU), IP24, com três idades de abate, I… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
2

Citation Types

0
15
0
12

Year Published

2010
2010
2020
2020

Publication Types

Select...
8

Relationship

0
8

Authors

Journals

citations
Cited by 42 publications
(27 citation statements)
references
References 7 publications
0
15
0
12
Order By: Relevance
“…For mature cow weight, an increase is undesired for extensive production systems since larger animals have increased requirements for maintenance and reproduction rates will decrease in environments where food sources are limited (e.g. extensive systems used in tropical regions; Montaño-Bermudez and Nielsen, 1990;Jenkins and Ferrell, 1994;Beretta et al, 2002). Thus, the results of the present study show that the use of probability of pregnancy at 16 months as a selection criterion will not increase mature weight of the dams since no significant differences (P < 0.01) in mature cow weight were observed between precocious and non-precocious cows.…”
Section: Discussionmentioning
confidence: 99%
“…For mature cow weight, an increase is undesired for extensive production systems since larger animals have increased requirements for maintenance and reproduction rates will decrease in environments where food sources are limited (e.g. extensive systems used in tropical regions; Montaño-Bermudez and Nielsen, 1990;Jenkins and Ferrell, 1994;Beretta et al, 2002). Thus, the results of the present study show that the use of probability of pregnancy at 16 months as a selection criterion will not increase mature weight of the dams since no significant differences (P < 0.01) in mature cow weight were observed between precocious and non-precocious cows.…”
Section: Discussionmentioning
confidence: 99%
“…The qualitative method discriminated the IEL and LEL clusters by a set of subfactors, herd health management, and production index records. This set includes essential aspects of the production systems that may determine productivity (Beretta et al, 2002). This comparison indicates that the farmers in the LEL cluster need to improve the basic processes of their beef cattle production systems in order to achieve intermediate efficiency.…”
Section: Discussionmentioning
confidence: 99%
“…Beretta et al (2002), em estudos de simulação de um sistema de ciclo completo de bovinos de corte estabilizado, encontraram resposta quadrática da TN em função da produtividade (kg de peso vivo/hectare de pastejo), da idade ao primeiro parto das fêmeas e ao abate dos machos. A maior produtividade foi verificada com TN entre 70 e 80%, para a idade ao primeiro parto das fêmeas aos dois anos.…”
Section: Methodsunclassified
“…6). O impacto da mudança introduzida na fase de cria foi menor quando se avaliou o sistema do ciclo completo de produção, no qual a resposta produtiva (kg PV/ha) à melhora dos coeficientes reprodutivos está condicionada à idade ao abate dos novilhos (Beretta et al, 2002 de 7,79, 7,36, 7,26 e 7,03%, na mesma ordem de citação (Tab. 8).…”
Section: Methodsunclassified
See 1 more Smart Citation