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Title: Economic weights for feed intake in the growing derived from a growth model and an economic model
Contributor(s): Hermesch, Susanne  (author)orcid ; Kanis, E (author); Eissen, JJ (author)
Publication Date: 2003
Open Access: Yes
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Abstract: Economic weights are obtained for feed intake using a growth model and an economic model. The underlying concept of the growth model is the linear plateau model. Parameters of this model are the marginal ratio (MR) of extra fat and extra protein deposition with increasing feed intake (FI) and the maximum protein deposition (Pdmax). The optimum feed intake (FI0) is defined as the minimum feed intake that meets energy requirements for Pdmax. The effect of varying FI and MR on performance traits was determined.An increase in FI results in a larger increase in growth rate with lower MR. For a given MR, feed conversion ratio is lowest when FI equals FI0. Lean meat percentage (LMP) is largest for a low MR in combination with a low FI. The decrease in LMP with higher FI is largest when FI exceeds FI0.Economic weights for FI, MR and Pdmax depend on FI in relation to FI0.Economic weights for FI are positive when FI is less than FI0 and negative when FI is larger than FI0. The MR has only then a negative economic weight, when FI is below FI0.Economic weights of FI and MR have a larger magnitude with lower MR and lower FI. In contrast, economic weights for growth rate and FI derived from the economic model only change in magnitude and not in sign with different levels of these traits. The economic model always puts a negative economic weight on FI since it expresses profit due to a decrease in FI with constant growth rate and LMP. This holds the risk of continuous decrease in FI in pig breeding programs. In contrast, the use of growth models for genetic improvement allows direct selection for an optimum feed intake which maximizes feed efficiency in combination with maximum lean meat growth. It is concluded that recording procedures have to be adapted to collect the data necessary to implement growth models in practical pig breeding applications.
Publication Type: Journal Article
Source of Publication: Journal of Animal Science, 81(4), p. 895-903
Publisher: American Society of Animal Science
Place of Publication: Savoy, Illinois, USA
ISSN: 0021-8812
Field of Research (FOR): 070201 Animal Breeding
Socio-Economic Outcome Codes: 830308 Pigs
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
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