Estimates of genetic parameters for feed intake, feeding behavior, and daily gain in composite ram lambs1,2

Cammack, K. M.; Leymaster, K. A.; Jenkins, Thomas G.; Nielsen, Marie Vejrup

doi:10.2527/2005.834777x

Cited by 87 publications

(79 citation statements)

References 22 publications

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“…This trait is a common measurement of growth and is an economically important characteristic in the breeding of mutton sheep. In addition, this trait has a high genetic and phenotypic correlation with feed efficiency (Cammack et al, 2005). Pre-weaning ADG was higher than the weight gains reported Similar to findings in multiple previous studies, lambs from higher litter sizes had reduced birth weights compared to single-born lambs across breed groups.…”

Section: Discussionsupporting

confidence: 78%

Growth and pre-weaning mortality of Katahdin lamb crosses

Mellado

Macías

Avendaño

et al. 2016

Rev Colomb Cienc Pecu

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SummaryBackground: Katahdin breed sheep is highly disseminated in Mexico. This breed and its crosses have recently gained attention among sheep producers. However, research with crosses between Katahdin and other meat breeds is limited. Objective: to evaluate the genetic and non-genetic factors affecting growth and mortality rate of crossbred lambs from Katahdin ewes fecundated with breeds specialized for meat production. Methods: crossbred lambs (n = 152) from Katahdin ewes sired with Hampshire (KH; n = 43), Texel (KT; n = 53) or Charolais (KCH; n = 56) were evaluated under intensive management conditions. The effects of genotype and non-genetic factors on birth weight, weaning weight, pre-weaning daily weight gain, and mortality rate were determined. Results: breed differences were not detected for birth weight (4 ± 1.1, 4.3 ± 0.9 and 4 ± 1.1 Kg for KCH, KH, KT, respectively), nor for the 60-d weaning weight (20.2 ± 4.3, 20.9 ± 4.3, 18.2 ± 4.2 Kg for KCH, KH, KT, respectively). Weight of lambs did not differ significantly between sexes, but it decreased (p<0.05) with increased litter size (weaning weight at 60 days for single, twins and triplets was 24.5 ± 2.6, 19.2 ± 3.5, and 14.3 ± 3.8 Kg, respectively). Pre-weaning mortality of KH lambs was 13.3% and it was significantly lower than that of the other genotypes (24.5 and 39.3% for KT and KCH, respectively). Conclusion: inclusion of Charolais, Hampshire or Texel rams in Katahdin flocks results in similar lamb weaning weight, but Hampshire-sired progeny excels regarding pre-weaning survival.

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Section: Discussionsupporting

confidence: 78%

Growth and pre-weaning mortality of Katahdin lamb crosses

Mellado

Macías

Avendaño

et al. 2016

Rev Colomb Cienc Pecu

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“…The FCF-fed lambs had higher standing, playing and resting activities compared to the TMR-fed lambs (P<0.05). Therefore our results with respect to feeding behaviours support idea that sheep with greater feed intake and growth rate tend to eat more meals per day and spend more time eating (Cammack et al, 2007). These results may probably be resulted in differences in phys- iological adaptation of lambs due to the fact that the behavioral responses might be indicators of physiological adaptation of lambs to the living environment (Ailian et al, 2008).…”

Section: Resultssupporting

confidence: 72%

Effects of Birth Weight and Feeding System on Fattening Performance and Feeding Behaviour of Karayaka Male Lambs

Yıldırım¹,

Ulutaş²,

Ocak³

et al. 2013

Italian Journal of Animal Science

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To determine effects of birth weight (BtW) and feeding system on fattening performance and behavioural responses of lambs, after birth 28 Karayaka male lambs were divided into two BtW groups, namely a low BtW (4.1±0.06 kg) and high BtW (5.0±0.09 kg). After weaning (90 days of age), seven lambs in each of these groups were fed individually ad libitum with total mixed ratio (TMR), consisted of 80% of a compound feed and 20% of roughage based on a dry matter basis (140 g crude protein and 2550 kcal ME/kg) and the other seven lambs were fed on the same ingredients as that of TMR but each ingredient was put in separate troughs (free choice feeding, FCF). Therefore the lambs were distributed into four groups according to 2 (low vs high BtW) × 2 (TMR vs FCF) factorial design. Live weight gains and intakes of dry matter, feedstuffs and nutrients of the lambs were affected by the FCF, but not by the BtW and their interaction. The daily weight gain (P<0.01), intakes of soybean meal and corn (P<0.01), dry matter (P<0.05), protein and energy (P<0.01) of FCF-fed lambs were higher than those of TMRfed lambs. FCF-fed lambs consumed less alfalfa hay, wheat bran and barley than TMR-fed lambs (P<0.01). The FCF increased rumination (P<0.01) and tend to rest more (P<0.05) compared to the TMR. The study suggests that FCF system can assist in enhancing the live weight gain by promoting the protein and energy intakes and by improving the welfare of lambs.

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“…The only known previous estimates of efficiency heritability in fish (0.3 in rainbow trout [24]) are also higher than in our data, however those were based on family means and thus represent overestimates. In our data, feed intake exhibited moderate heritability (0.17-0.32) that is typical of feed consumption traits in terrestrial species (e.g., 0.25 [5], 0.23 [19]) and midway between previous estimates for rainbow trout (average 0.10 [22]) and catfish Ictalurus punctatus (0.41 [42]). …”

Section: Genetic Improvement Of Feed Efficiencymentioning

confidence: 52%

“…Daily gain was calculated as the difference between the initial and the final body weights, divided by the number of days in the trial (77-80 d, depending on the tank). Individual DFI was calculated by fitting repeated measures analysis of variance with measurement time (1)(2)(3)(4)(5) as the random repeated factor, and then calculating least squares means for each individual (MIXED procedure, SAS  9.1; SAS  Inst. Inc., US).…”

Section: Traits Recordedmentioning

confidence: 99%

Breeding salmonids for feed efficiency in current fishmeal and future plant-based diet environments

Quinton

Kause

Koskela³

et al. 2007

Genet Sel Evol

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-The aquaculture industry is increasingly replacing fishmeal in feeds for carnivorous fish with soybean meal (SBM). This diet change presents a potential for genotype-environment (G × E) interactions. We tested whether current salmonid breeding programmes that evaluate and select within fishmeal diets also improve growth and efficiency on potential future SBM diets. A total of 1680 European whitefish from 70 families were reared with either fishmeal-or SBM-based diets in a split-family design. Individual daily gain (DG), daily feed intake (DFI) and feed efficiency (FE) were recorded. Traits displayed only weak G × E interactions as variances and heritabilities did not differ substantially between the diets, and cross-diet genetic correlations were near unity. In both diets, DFI exhibited moderate heritability and had very high genetic correlation with DG whereas FE had low heritability. Predicted genetic responses demonstrated that selection to increase DG and FE on the fishmeal diet lead to favourable responses on the SBM diet. Selection for FE based on an index including DG and DFI achieved at least double FE gain versus selection on DG alone. Therefore, current breeding programmes are improving the biological ability of salmonids to use novel plant-based diets, and aiding the aquaculture industry to reduce fishmeal use.feed efficiency / genotype-environment interaction / selection / aquaculture / Coregonus

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Estimates of genetic parameters for feed intake, feeding behavior, and daily gain in composite ram lambs1,2

Cited by 87 publications

References 22 publications

Growth and pre-weaning mortality of Katahdin lamb crosses

Growth and pre-weaning mortality of Katahdin lamb crosses

Effects of Birth Weight and Feeding System on Fattening Performance and Feeding Behaviour of Karayaka Male Lambs

Breeding salmonids for feed efficiency in current fishmeal and future plant-based diet environments

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