Kinetics of genetic progress on growth performance in a synthetic strain of rabbit

2018 ◽  
Author(s):  
Ikhlef Lynda ◽  
Kaidi Rachid ◽  
Benidir Mohamed ◽  
Ghozlane Faissal
Keyword(s):  
Local Population ◽  
Average Daily Gain ◽  
Direct Selection ◽  
Genetic Progress ◽  
Complementarity Effect ◽  
Growth Performances ◽  
Slaughter Age ◽  
Successive Generations ◽  
Kinetics Of ◽  
Daily Gain

The objective of this study is to evaluate the growth performances and some genetic parameters of a synthetic rabbit strain over 3 successive generations (G4, G5 and G6), resulted from crossing between the local population and the INRA2666 Strain (France).The results indicated that all the growth indicators (average live weights at birth, weaning and slaughter, average daily gain in pre-weaning and post-weaning) show overall better performance levels than those observed by Several authors for the local population. The crossing thus effectively improved the average daily gain and reduced the slaughter age by two weeks. The study of correlations between growth criteria showed that early selection of weight and average daily gain is effective but that direct selection on average daily gain may also improve the weight by indirect or correlative effect. Finally, the kinetics of genetic progress indicates a fluctuation in genetic progress from one generation to another, which proves that this synthetic strain benefited from the complementarity effect without having undergone a selection on the growth criteria.

scholarly journals EFFECTS OF SLAUGHTER’ AGE ON GROWTH PERFORMANCE, CARCASS AND NON-CARCASS COMPONENTS TRAITS OF BERBER BREED LAMBS

2021 ◽  
Vol 52 (6) ◽  
pp. 1401-1407
Author(s):  
S. Atroun ◽  
C. Aissaoui ◽  
S. Smeti ◽  
N. Atti
Keyword(s):  
Body Weight ◽  
Growth Performance ◽  
Average Daily Gain ◽  
Carcass Composition ◽  
Carcass Yield ◽  
Body Weights ◽  
Slaughter Age ◽  
Daily Gain

The objective of this work was to study the lamb’s growth, the carcass yield and composition and the importance of main organs of Berber lambs slaughtered at 4 or 6 months. The study concerned 40 lambs reared under motherhood. Lambs of the first group were slaughtered at the age of 4 months (4M) and the second at 6 months (6M). Slaughter body weights (BW), hot and cold carcass weights and organs were recorded. The carcass was cut out and dissected. The average BW at birth was 4.14 + 0.506 kg while the BW at slaughter was 22.86 kg + 3.40 and 31.51 + 3.50 kg for 4M and 6M groups, respectively. The average daily gain were 172 and 164g for 4M and 6M groups, respectively. Therefore, during 2months the lambs of 6M group gained 8.67 kg in BW. The carcasses were heavier for 6M than 4M. The carcass commercial yields were 42% and 45% for 4M and 6M groups, respectively, resulting in 4.1 kg gain of meat during 2 months. The tissular (muscle, fat and bone) and the regional (leg, shoulder …) carcass composition did not differ among groups. All organs were heavier for 6M than 4M; however, their proportion in the empty body weight were variables. The BWand carcass gain at six months are encouraging to prolong the lamb’s slaughter age without carcass composition difference given the similar fat proportion in the carcass of both groups.

Genetic parameters for growth rate and Kleiber ratios of Nellore sheep

2018 ◽  
Author(s):  
I. Satish Kumar ◽  
G. Gangaraju ◽  
C. Vijaya Kumar ◽  
Sapna Nath
Keyword(s):  
Andhra Pradesh ◽  
Growth Traits ◽  
Average Daily Gain ◽  
Genetic Correlations ◽  
Research Station ◽  
Genetic Progress ◽  
Stages Of Growth ◽  
Kleiber Ratio ◽  
Nellore Sheep ◽  
Daily Gain

Data on growth traits of Nellore sheep were extracted from the records maintained at Livestock Research Station, Palamaner, Andhra Pradesh, India for a period of five years. The genetic and phenotypic parameters were estimated for growth traits i.e., average daily gain (ADG) from birth to 3 months (ADGa), 3 months to 6 months (ADGb), 6 to 12 months (ADGc) and the corresponding Kleiber ratio (KR) at respective stages of growth. The non genetic factors included in the model were having significance on most of the traits studied. The heritability estimates for ADG and corresponding KR ranged from 0.17 to 0.25. The estimates of genetic correlations among the traits ranged between -0.28 (Ka-Kb) and 0.99 (ADGb-Kb). The moderate estimates of heritability, high and positive genetic correlations among the traits in the study were suggestive of moderate genetic progress in the Nellore breed of sheep through selection.

Caecal microbiome and metabolites associated with different growth performances of broilers

2019 ◽  
Author(s):  
Xue Chen ◽  
Wei Zhao ◽  
Yang-zhi Liu ◽  
Natnael Demelash ◽  
Zhe Sun ◽  
...  
Keyword(s):  
Amino Acids ◽  
Body Weight ◽  
Metabolic Pathways ◽  
Broiler Chickens ◽  
Average Daily Gain ◽  
Poor Performance ◽  
Hexadecanoic Acid ◽  
Microbial Composition ◽  
Growth Performances ◽  
Daily Gain

We investigated changes in the caecal microbial composition and metabolic compounds of broiler chickens weighing approximately 0.8–1.5 kg. Arbor Acres (AA) broilers (n =186) were divided into four groups (A–D) according to body weight on day 35. The results showed that there were significant differences in the average daily feed intake (ADFI), average daily gain (ADG), and feed-to-gain ratio (F:G) of chickens (P less than 0.05). The abundance of 11 genera were found to be significantly different in the four groups (P less than 0.05). The broilers with poor performance had increased levels of D-mannose, hexadecanoic acid, cholesterol, L-valine, L-leucine, glutamic acid, glucopyranose, á-D-allopyranose, and phosphoric acid (P less than 0.05) in the cecum. Microbial compositions were different in the ceca of broilers with different growth performances, and higher growth performance correlated with changes in metabolic pathways related to energy, amino acids, and others.

scholarly journals INFLUENCE OF FARMING SYSTEMS ON INDICATORS OF BEEF CALVES GROWTH

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
J. Ducháček ◽  
R. Toušová ◽  
L. Stádník ◽  
Z. Biniová ◽  
M. Ptáček ◽  
...  
Keyword(s):  
Average Daily Gain ◽  
Live Weight ◽  
Farming Systems ◽  
Farming System ◽  
Genetic Progress ◽  
Ecological Farming ◽  
Model Equations ◽  
Daily Gain ◽  
Selection Of ◽  
Growth Ability

The aim of this study was to evaluate growth ability of Charolais calves in different systems of farming. The observations were performed in period of 8 years (2007 - 2014) in one herd, which was transiting from conventional to ecological farming system. Period from 2007 to 2010 was of conventional character, 2010 to 2012 transition phase, and from 2012 to 2014 ecological phase. This transfer is directly linked to changes in cow´s welfare and nutrition. Growth ability (live weight at birth, 120, and 210 days of age, average daily gain from birth to 120, from birth to 210, and from 120 to 210 days of age) of 518 Charolais calves was measured. Statistical analyses were performed using SAS 9.3 software, GLM procedure. The model equations contend effect of sex, number of parity, month of calves birth and type of farming system. Difference in birth weight of calves between farming systems was small and insignificant. This fact may be due to breeding system focused on easy calving. Increase of values measured in different age and average daily gains were statistical significant (P < 0.05) between conventional and ecological farming. The increase of parameters of weight and average daily gain could be largely connected with genetic progress in Charolais population in Czech Republic and following good selection of bulls to insemination and natural breeding. Nevertheless, the transition from conventional to ecological farming system did not affected growth ability of beef cattle negatively and, in contrary, results of growth improved farm economy.

scholarly journals Ranking of Four Types Fodder as Sole Diet Considering Biological Characteristics and Growth of Local Growing Bulls

2019 ◽  
pp. 1-9
Author(s):  
Khan Shahidul Huque ◽  
Biplob Kumer Roy ◽  
Nazmul Huda
Keyword(s):  
Cost Efficiency ◽  
Production Efficiency ◽  
Block Design ◽  
Average Daily Gain ◽  
Biological Characteristics ◽  
Feed Conversion ◽  
Arithmetic Average ◽  
Randomized Block Design ◽  
Growth Performances ◽  
Daily Gain

Aims: In this experiment, evaluation of intake, digestibility and growth performances of local growing bulls by feeding Jumbo-green, Para and German grass based on Index (Mf) of Maize are considered and ranked this fodder accordingly. Study Design:  Completely randomized block design. Place and Duration of Study: Bangladesh Livestock Research Institute (BLRI), Savar, Dhaka, between July 2016 and September 2016. Methodology: Biomass production efficiency (Xddm), animal production efficiency (Xap), CH4 emission deduction efficiency (XCH4) and benefit to cost efficiency (Xbc) was considered to identify the biological characteristics of four fodders. Statistical analysis was done through SPSS-17 to evaluate the intake, digestibility and growth of animal. Rank of each fodder was calculated through the equation of Maize index (Mi) = (Xddm + Xap + XCH4 + Xbc)/4. Results: Aggregation of four arithmetic average efficiency; Jumbo-green, Para and German got 0.42, 0.40 and 0.72 point out of 1.0 point of Mi, respectively. Among four fodders German grass performed best in terms of average daily gain (107 gm/d) and feed conversion ratio (46.9) compared to maize silage (64 gm/d & 58.4, respectively). Weight loss of bulls fed Jumbo and Para has occurred unexpectedly. Conclusion: In combination of mathematical calculation and statistical evaluation, the rank of four fodders measured as Maize>German>Jumbo-green>Para.

scholarly journals The effects of Bacillus spp. use as a dietary probiotic in weaning piglets

2019 ◽  
Author(s):  
Mihaela Dumitru ◽  
Mihaela Hăbeanu ◽  
Ionuț Sorescu ◽  
Cristina Tabuc
Keyword(s):  
Feed Efficiency ◽  
Average Daily Gain ◽  
Microbiological Analysis ◽  
Homogeneous Groups ◽  
Growth Performances ◽  
Significant Difference ◽  
Bacillus Subtilis Atcc ◽  
Bacillus Spp ◽  
Weaning Piglets ◽  
Daily Gain

Abstract Background: This study was conducted to evaluate the effects of supplementation with Bacillus-based probiotic (Bacillus subtilis ATCC 6051a, 1.6x109CFU/ml) on the performance of weaned piglets. Methods: A total of 60 piglets, 30 days±3 days of age, with an initial body weight (BW) of 8.41±0.92 kg were allotted randomly to 3 homogeneous groups (C, E1 and E2, 6 pens/10 piglets, 2 replicates/group) with a supplement of additive (Bs) based on 1% (E1), respectively 3% (E2)/kg feed. The feed was administered ad libitum in the flour form, 2 meals/day. Microbiological analysis and chemical composition of compound feed, the growth performances and diarrhoea incidence were assayed as well. Results: The addition of Bs didn’t influence significantly the BW or average daily gain (ADG). After 16 testing days, ADG was 1.13 times higher in E1 compared with C and with 1.04 times higher compared with E2. The feed intake (ADFI) increased with 1.08-fold in C diet compared with E1 diet. Feed efficiency diet was 1.22 times higher in E1 than C and with 1.05 higher than E2 diet. Conclusions: Addition of Bs-1% decreased diarrhoea incidence (P>0.05) by 7.6% vs. C and 3.8% vs. Bs-3%. 23.4% piglets had soft faeces, 43.75% score 2 (mild diarrhoea) and 32.81% score 3 (severe diarrhoea), no significant difference was noticed between the group (P˂0.05).

scholarly journals Genetic correlations between growth performance and carcass traits of purebred and crossbred pigs raised in tropical and temperate climates1

2019 ◽  
Vol 97 (9) ◽  
pp. 3648-3657 ◽  
Author(s):  
Rodrigo M Godinho ◽  
Rob Bergsma ◽  
Fabyano F Silva ◽  
Claudia A Sevillano ◽  
Egbert F Knol ◽  
...  
Keyword(s):  
Growth Performance ◽  
Average Daily Gain ◽  
Genetic Correlations ◽  
Direct Selection ◽  
Environment Interaction ◽  
Finishing Pigs ◽  
Genetic Progress ◽  
Climate Conditions ◽  
Pork Production ◽  
Commercial Farms

Abstract In pig breeding, selection commonly takes place in purebred (PB) pigs raised mainly in temperate climates (TEMP) under optimal environmental conditions in nucleus farms. However, pork production typically makes use of crossbred (CB) animals raised in nonstandardized commercial farms, which are located not only in TEMP regions but also in tropical and subtropical regions (TROP). Besides the differences in the genetic background of PB and CB, differences in climate conditions, and differences between nucleus and commercial farms can lower the genetic correlation between the performance of PB in the TEMP (PBTEMP) and CB in the TROP (CBTROP). Genetic correlations (rg) between the performance of PB and CB growing-finishing pigs in TROP and TEMP environments have not been reported yet, due to the scarcity of data in both CB and TROP. Therefore, the present study aimed 1) to verify the presence of genotype × environment interaction (G × E) and 2) to estimate the rg for carcass and growth performance traits when PB and 3-way CB pigs are raised in 2 different climatic environments (TROP and TEMP). Phenotypic records of 217,332 PB and 195,978 CB, representing 2 climatic environments: TROP (Brazil) and TEMP (Canada, France, and the Netherlands) were available for this study. The PB population consisted of 2 sire lines, and the CB population consisted of terminal 3-way cross progeny generated by crossing sires from one of the PB sire lines with commercially available 2-way maternal sow crosses. G × E appears to be present for average daily gain, protein deposition, and muscle depth given the rg estimates between PB in both environments (0.64 to 0.79). With the presence of G × E, phenotypes should be collected in TROP when the objective is to improve the performance of CB in the TROP. Also, based on the rg estimates between PBTEMP and CBTROP (0.22 to 0.25), and on the expected responses to selection, selecting based only on the performance of PBTEMP would give limited genetic progress in the CBTROP. The rg estimates between PBTROP and CBTROP are high (0.80 to 0.99), suggesting that combined crossbred–purebred selection schemes would probably not be necessary to increase genetic progress in CBTROP. However, the calculated responses to selection show that when the objective is the improvement of CBTROP, direct selection based on the performance of CBTROP has the potential to lead to the higher genetic progress compared with indirect selection on the performance of PBTROP.

COMPARISONS OF CROSSBRED CALVES BY SOUTH DEVON, MAINE- ANJOU AND SIMMENTAL SIRES FOR SOME BEEF PRODUCTION TRAITS

1974 ◽  
Vol 54 (2) ◽  
pp. 197-203 ◽  
Author(s):  
J. A. NEWMAN ◽  
G. M. WEISS ◽  
B. SCHRADER
Keyword(s):  
Birth Weight ◽  
Significant Interaction ◽  
Statistical Significance ◽  
Average Daily Gain ◽  
Carcass Weight ◽  
Production Traits ◽  
Marbling Score ◽  
Weaning Weight ◽  
Slaughter Age ◽  
Daily Gain

Breed of sire comparisons are made amongst calves born to commercial Hereford cows and sired by bulls of the South Devon (SD, 10 bulls used), Maine-Anjou (MA, two bulls used) and Simmental (SIM, eight bulls used) breeds. Numbers of observations ranged from 239 bulls and 224 heifers for "ease of birth" to 98 bulls for carcass traits. The feedlot test period was 91 days and three feedlot treatments were imposed. Slaughter criteria were subjective and "breed-of-sire" differences in slaughter age and carcass weight were not statistically significant (P > 0.05). Differences amongst breed-of-sire means attained statistical significance for "birth weight" (MA > SIM > SD; P < 0.001), weaning weight of males (MA > SIM > SD; P < 0.001), "on-test" weight (MA > SIM > SD; P < 0.001), average daily gain on test (MA > SIM > SD; P < 0.001) average fat depth/100 kg carcass weight (SD > MA = SIM, P < 0.05), trimmed, de-boned, defatted primal cuts per day of age (MA > SIM > SD; P < 0.01), meat marbling score (SD more marbled than SIM more marbled than MA; P <.05). A significant interaction existed between breed of sire and feeding group for average daily gain on test (P < 0.01) and cutability (P < 0.025). Breed-of-sire differences did not attain statistical significance for weaning weight of female calves, loin area/100 kg carcass weight, cut-ability, or meat color score.

scholarly journals Carcass and meat quality traits of Saanen goat kids reared under natural and artificial systems and slaughtered at different ages

2018 ◽  
Vol 87 (3) ◽  
pp. 293-300 ◽  
Author(s):  
Hulya Yalcintan ◽  
Pembe Dilara Akin ◽  
Nursen Ozturk ◽  
Bulent Ekiz ◽  
Omur Kocak ◽  
...  
Keyword(s):  
Body Weight ◽  
Meat Quality ◽  
Average Daily Gain ◽  
Carcass Weight ◽  
Quality Traits ◽  
Saanen Goat ◽  
Slaughter Weight ◽  
Meat Quality Traits ◽  
Slaughter Age ◽  
Daily Gain

Production of high-quality carcass and meat from goat kids may contribute to an increase in goat farming profitability. The aim was to compare carcass and meat quality traits of Saanen goat kids raised under natural (NR) and artificial (AR) rearing systems and slaughtered at 80 days and 120 days of age. The AR kids were separated from their dams immediately after birth and were fed with a commercial milk replacer, while the NR kids suckled their mothers. The rearing type did not affect the average daily gain, slaughter weight, hot carcass weight, empty body weight, commercial dressing percentage, subjective conformation and fatness scores. In parallel with the increase in slaughter age, the slaughter weight, hot carcass weight, empty body weight and subjective carcass conformation score increased. The rearing type had no effect on instrumental meat quality traits, except for meat Lightness (L*) and Hue values. Meat from NR kids had higher L* and Hue values 1 h and 24 h after cutting than those of AR kids. Warner-Bratzler shear force value increased with the slaughter age, but the meat lightness decreased. The ultimate pH was generally high in all groups, ranging between 5.94 and 6.10. The panellists evaluated the meat from NR kids to be more tender and juicy and also gave the highest tenderness scores to the meat obtained from the kids slaughtered at 80 days of age. As a conclusion, the slaughter age may be more determinant than the rearing type in the occurrence of carcass and meat quality characteristics.

scholarly journals Selection indexes for genetic improvement of yearling weight in Egyptian buffaloes

2010 ◽  
Vol 53 (4) ◽  
pp. 436-446
Author(s):  
K. A. Shahin ◽  
O. Y. Abdallah ◽  
T. A. Fooda ◽  
K. A. Mourad
Keyword(s):  
Body Weight ◽  
Genetic Improvement ◽  
Average Daily Gain ◽  
Breeding Value ◽  
Direct Selection ◽  
Body Weights ◽  
Practical Standpoint ◽  
Selection Indexes ◽  
Selection For ◽  
Daily Gain

Abstract. Estimates of genetic and phenotypic parameters for body weight at birth, 3, 6, 9, and 12 months of age, and for preweaning and postweaning average daily gain were computed and used to construct 14 selection indexes to improve the 12-month weight in Egyptian buffaloes. The full index incorporating body weight at birth, 3, 6, 9 and 12 months of age had the highest correlation with aggregate breeding value (rTI=0.63). The correlation fell to 0.62 when body weight at birth and 3 months were omitted from the index. Selection for body weight at 12 months of age alone is expected to be 76.2 % as efficient as selection for the full index. The maximum expected genetic gain in 12-month body weight was 8.85 kg/generation when all five body weights were included in the index; this decreased to 8.09 kg/generation when body weights at birth, 3 and 6 months were excluded and further decreased to 6.94 kg/ generation when selection based on yearling weight only. From the practical standpoint, selection on I5 involving body weight at 9 month of age can be considered as the best for improving body weight at 12 month since its application is earlier, less expensive, higher accuracy than any index excluding body weight at 12 month and giving reasonable amount (+5.39 kg) improvement in yearling weight as compared to direct selection (+6.94 kg).

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