Feed efficiency of rainbow trout can be improved through selection: different genetic potential on alternative diets

A Kause, Declan Tobin, D F Houlihan, S A M Martin, E A Mantysaari, O Ritola, K Ruohonen

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

To assess the genetic potential for selection of increased feed efficiency in rainbow trout (Oncorhynchus mykiss), we estimated the heritabilities and correlations for BW, daily weight gain (DG), and daily feed intake (DFI). Body weight was recorded 5 times, and DG and DFI 3 times during a feeding trial lasting 22 mo. To test the hypothesis that phenotypic and genetic parameters were influenced by a nutritional environment, fish were fed either a modern normal protein diet (NP, 40 to 45% protein and 30 to 33% lipid) or an alternative high protein diet (HP, 50 to 56% protein, 20 to 24% lipid) in a split-family design. Results showed that there were no large differences in heritabilities between the diets. Average heritability for DFI over 2 both diets and different fish ages was low (average h = 0.10), indicating that modest genetic changes in response to selection can be obtained. Average heritabilities for BW and DG over both diets and different fish ages were 0.28 and 0.33, respectively. The NP diet enabled fish to express a wide range of BW, as shown by the increased coefficients of phenotypic variation for BW. Fish fed the HP diet showed increased phenotypic variation for DFI in > 750-g fish. On the NP diet, genetic correlations of DFI with DG and BW were very strong for 750- to 2,000-g fish. In contrast, on the HP diet, the respective correlations were moderate to low, revealing more genetic potential to change growth and feed intake simultaneously in opposite directions. An analysis of the predicted selection responses showed that selection solely for high DG improved feed efficiency as a correlated genetic response. Simultaneous selection for high DG and reduced DFI, in turn, may increase genetic gain in feed efficiency by a factor of 1.2 compared with selection solely for DG. However, variation for growth and feed intake and the relationships between these traits were different in different nutritional environments, leading to divergent genetic responses on the alternative diets.

Original languageEnglish
Pages (from-to)807-817
Number of pages11
JournalJournal of Animal Science
Volume84
Publication statusPublished - 2006

Keywords

  • feed efficiency
  • feed intake
  • genotype-by-environment interaction
  • heritability
  • quantitative genetics
  • rainbow trout
  • SALMON SALMO-SALAR
  • CONVERSION EFFICIENCY
  • ONCORHYNCHUS-MYKISS
  • GROWTH
  • REQUIREMENTS
  • FISH
  • WILD
  • VARIABILITY
  • TRAITS
  • ENERGY

Cite this

Kause, A., Tobin, D., Houlihan, D. F., Martin, S. A. M., Mantysaari, E. A., Ritola, O., & Ruohonen, K. (2006). Feed efficiency of rainbow trout can be improved through selection: different genetic potential on alternative diets. Journal of Animal Science, 84, 807-817.

Feed efficiency of rainbow trout can be improved through selection : different genetic potential on alternative diets. / Kause, A ; Tobin, Declan; Houlihan, D F ; Martin, S A M ; Mantysaari, E A ; Ritola, O ; Ruohonen, K .

In: Journal of Animal Science, Vol. 84, 2006, p. 807-817.

Research output: Contribution to journalArticle

Kause, A, Tobin, D, Houlihan, DF, Martin, SAM, Mantysaari, EA, Ritola, O & Ruohonen, K 2006, 'Feed efficiency of rainbow trout can be improved through selection: different genetic potential on alternative diets', Journal of Animal Science, vol. 84, pp. 807-817.
Kause, A ; Tobin, Declan ; Houlihan, D F ; Martin, S A M ; Mantysaari, E A ; Ritola, O ; Ruohonen, K . / Feed efficiency of rainbow trout can be improved through selection : different genetic potential on alternative diets. In: Journal of Animal Science. 2006 ; Vol. 84. pp. 807-817.
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abstract = "To assess the genetic potential for selection of increased feed efficiency in rainbow trout (Oncorhynchus mykiss), we estimated the heritabilities and correlations for BW, daily weight gain (DG), and daily feed intake (DFI). Body weight was recorded 5 times, and DG and DFI 3 times during a feeding trial lasting 22 mo. To test the hypothesis that phenotypic and genetic parameters were influenced by a nutritional environment, fish were fed either a modern normal protein diet (NP, 40 to 45{\%} protein and 30 to 33{\%} lipid) or an alternative high protein diet (HP, 50 to 56{\%} protein, 20 to 24{\%} lipid) in a split-family design. Results showed that there were no large differences in heritabilities between the diets. Average heritability for DFI over 2 both diets and different fish ages was low (average h = 0.10), indicating that modest genetic changes in response to selection can be obtained. Average heritabilities for BW and DG over both diets and different fish ages were 0.28 and 0.33, respectively. The NP diet enabled fish to express a wide range of BW, as shown by the increased coefficients of phenotypic variation for BW. Fish fed the HP diet showed increased phenotypic variation for DFI in > 750-g fish. On the NP diet, genetic correlations of DFI with DG and BW were very strong for 750- to 2,000-g fish. In contrast, on the HP diet, the respective correlations were moderate to low, revealing more genetic potential to change growth and feed intake simultaneously in opposite directions. An analysis of the predicted selection responses showed that selection solely for high DG improved feed efficiency as a correlated genetic response. Simultaneous selection for high DG and reduced DFI, in turn, may increase genetic gain in feed efficiency by a factor of 1.2 compared with selection solely for DG. However, variation for growth and feed intake and the relationships between these traits were different in different nutritional environments, leading to divergent genetic responses on the alternative diets.",
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T1 - Feed efficiency of rainbow trout can be improved through selection

T2 - different genetic potential on alternative diets

AU - Kause, A

AU - Tobin, Declan

AU - Houlihan, D F

AU - Martin, S A M

AU - Mantysaari, E A

AU - Ritola, O

AU - Ruohonen, K

PY - 2006

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N2 - To assess the genetic potential for selection of increased feed efficiency in rainbow trout (Oncorhynchus mykiss), we estimated the heritabilities and correlations for BW, daily weight gain (DG), and daily feed intake (DFI). Body weight was recorded 5 times, and DG and DFI 3 times during a feeding trial lasting 22 mo. To test the hypothesis that phenotypic and genetic parameters were influenced by a nutritional environment, fish were fed either a modern normal protein diet (NP, 40 to 45% protein and 30 to 33% lipid) or an alternative high protein diet (HP, 50 to 56% protein, 20 to 24% lipid) in a split-family design. Results showed that there were no large differences in heritabilities between the diets. Average heritability for DFI over 2 both diets and different fish ages was low (average h = 0.10), indicating that modest genetic changes in response to selection can be obtained. Average heritabilities for BW and DG over both diets and different fish ages were 0.28 and 0.33, respectively. The NP diet enabled fish to express a wide range of BW, as shown by the increased coefficients of phenotypic variation for BW. Fish fed the HP diet showed increased phenotypic variation for DFI in > 750-g fish. On the NP diet, genetic correlations of DFI with DG and BW were very strong for 750- to 2,000-g fish. In contrast, on the HP diet, the respective correlations were moderate to low, revealing more genetic potential to change growth and feed intake simultaneously in opposite directions. An analysis of the predicted selection responses showed that selection solely for high DG improved feed efficiency as a correlated genetic response. Simultaneous selection for high DG and reduced DFI, in turn, may increase genetic gain in feed efficiency by a factor of 1.2 compared with selection solely for DG. However, variation for growth and feed intake and the relationships between these traits were different in different nutritional environments, leading to divergent genetic responses on the alternative diets.

AB - To assess the genetic potential for selection of increased feed efficiency in rainbow trout (Oncorhynchus mykiss), we estimated the heritabilities and correlations for BW, daily weight gain (DG), and daily feed intake (DFI). Body weight was recorded 5 times, and DG and DFI 3 times during a feeding trial lasting 22 mo. To test the hypothesis that phenotypic and genetic parameters were influenced by a nutritional environment, fish were fed either a modern normal protein diet (NP, 40 to 45% protein and 30 to 33% lipid) or an alternative high protein diet (HP, 50 to 56% protein, 20 to 24% lipid) in a split-family design. Results showed that there were no large differences in heritabilities between the diets. Average heritability for DFI over 2 both diets and different fish ages was low (average h = 0.10), indicating that modest genetic changes in response to selection can be obtained. Average heritabilities for BW and DG over both diets and different fish ages were 0.28 and 0.33, respectively. The NP diet enabled fish to express a wide range of BW, as shown by the increased coefficients of phenotypic variation for BW. Fish fed the HP diet showed increased phenotypic variation for DFI in > 750-g fish. On the NP diet, genetic correlations of DFI with DG and BW were very strong for 750- to 2,000-g fish. In contrast, on the HP diet, the respective correlations were moderate to low, revealing more genetic potential to change growth and feed intake simultaneously in opposite directions. An analysis of the predicted selection responses showed that selection solely for high DG improved feed efficiency as a correlated genetic response. Simultaneous selection for high DG and reduced DFI, in turn, may increase genetic gain in feed efficiency by a factor of 1.2 compared with selection solely for DG. However, variation for growth and feed intake and the relationships between these traits were different in different nutritional environments, leading to divergent genetic responses on the alternative diets.

KW - feed efficiency

KW - feed intake

KW - genotype-by-environment interaction

KW - heritability

KW - quantitative genetics

KW - rainbow trout

KW - SALMON SALMO-SALAR

KW - CONVERSION EFFICIENCY

KW - ONCORHYNCHUS-MYKISS

KW - GROWTH

KW - REQUIREMENTS

KW - FISH

KW - WILD

KW - VARIABILITY

KW - TRAITS

KW - ENERGY

M3 - Article

VL - 84

SP - 807

EP - 817

JO - Journal of Animal Science

JF - Journal of Animal Science

SN - 0021-8812

ER -