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Modelling the impact of sow replacement rate on farm performance

Henrique da Costa Mendes Muniz et al · Sociedade Brasileira de Zootecnia · 2024

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A survey of dairy calf management practices in some producing regions in Brazil

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ABSTRACT This study aimed to develop and assess a deterministic mathematical model for predicting the impacts of varying sow replacement rates on the performance of farms producing weaned piglets. Initially, the influence of replacement rate on herd structure was examined using two equations, which accounted for the percentage of sows replaced (55, 45, and 35%), retention rates between parities (13, 9, and 5%), and number of last parities in the herd (6, 7, and 8). The model then estimated sow development throughout the reproductive cycle, starting with an initial weight of 140 kg at first mating and adjusting for weight gains during gestation and losses during lactation, influenced by the varying number of live-born piglets across parities. Energy requirements were calculated using the factorial method, which included maintenance, protein and fat gains, and milk production. The generated data formed various scenarios to derive productive values. These scenarios were analyzed using analysis of variance with the general linear model procedure, treating each scenario as a separate treatment. Early parities (up to P3) contributed 42% in SC-35, 51% in SC-45, and 60% in SC-55. Significant differences were noted in variables such as average parity, birth weight, feed intake during gestation, and average piglet weight gain. The developed model, incorporating replacement gilt modules, gestation, and lactation, can effectively predict herd structure by parity and assess the impact of annual sow replacement rates on the productivity of farms rearing weaned piglets.

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APA 7

al, H. D. C. M. M. E. (2024). Modelling the impact of sow replacement rate on farm performance. https://doi.org/10.37496/rbz5320230037

MLA

al, Henrique da Costa Mendes Muniz et. "Modelling the impact of sow replacement rate on farm performance." 2024. https://doi.org/10.37496/rbz5320230037.

Chicago

al, Henrique da Costa Mendes Muniz et. 2024. "Modelling the impact of sow replacement rate on farm performance.". https://doi.org/10.37496/rbz5320230037.

Harvard

al, H. D. C. M. M. E. 2024, Modelling the impact of sow replacement rate on farm performance, Sociedade Brasileira de Zootecnia, available at: https://doi.org/10.37496/rbz5320230037 [Accessed 29 Jun. 2026].

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Título
Modelling the impact of sow replacement rate on farm performance
Autor / colaboradores
Henrique da Costa Mendes Muniz et al
Editorial
Sociedade Brasileira de Zootecnia
Año de publicación
2024
ISSN
1806-9290
ISSN
1806-9290
Idioma
eng

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