AIREML estimation of genetic parameters and study of factors affecting growth and fertility performance of sire line of IBL-80 broiler chicken

2019 ◽  
Author(s):  
Swayamprabha Naik ◽  
Shakti Kant Dash ◽  
Prem Prakash Dubey ◽  
Jaspreet Singh Arora ◽  
Saroj Kumar Sahoo ◽  
...  
Keyword(s):  
Broiler Chicken ◽  
Genetic Parameters ◽  
Negative Association ◽  
Growth Line ◽  
Additive Variance ◽  
Factors Affecting ◽  
The Mean ◽  
Correlation Estimate ◽  
Fertility Traits ◽  
Estimation Of Genetic Parameters

The present investigation included the data of 29,879 birds pertaining to 8 generations, from 2010 to 2018 on growth line (PB1) of IBL-80 broiler. The mean estimates of growth and fertility traits were BWT0 (39.97±0.05 gms), BWT5 (1189.17±1.45 gms), BWT10 (1723.59±6.26 gms), BWT15 (2165.71±7.90 gms), BWT20 (2611.23±4.10 gms), ADG5 (32.36±0.07 gms/day), ADG10 (13.09±0.14 gms/day), ADG15 (12.38±0.13 gms/day), ADG20 (12.65±0.13 gms/day), AFE (171.80±0.21 days) and ENO40 (62.47±0.25) which indicated higher growth performance of PB1 affected its fertility performance. ADG5 had highest estimate indicating higher growth during chick stage. Least squares analysis indicated that effect of gender, month of hatch and generation were significant (p less than 0.01) for all growth and fertility traits. AIREML heritability estimates indicated appreciable additive variance in BWT0 (0.50), BWT5 (0.54) and ADG5 (0.20). Other growth and fertility traits had lower heritability which was due to stage wise selection in breeder flock. Phenotypic and genetic correlation estimate indicated negative association between growth and fertility traits.

Genetic parameters and phenotypic trends in the mean and variability of number of stillborn piglets and changes in their relationships with litter size and gestation length

2013 ◽  
Vol 53 (5) ◽  
pp. 395 ◽  
Author(s):  
Craig R. G. Lewis ◽  
Susanne Hermesch
Keyword(s):  
Genetic Parameters ◽  
Gestation Length ◽  
Genetic Associations ◽  
Large White ◽  
Factors Affecting ◽  
Breed Differences ◽  
Trends Over Time ◽  
The Mean ◽  
Using Data ◽  
Over Time

This study examined changes in genetic and phenotypic factors affecting stillborn piglets (SB). Over 15 years, 76 851 litter records were available from Large White (LW), Landrace (LR) and Duroc (DU) sows to investigate SB. The analyses focussed on trends over time in SB and the changes in the number of SB per litter, in factors associated with SB and in genetic parameters for SB. Breed differences were identified with DU producing more SB than the white breeds (mean of 1.46 ± 0.02 vs 1.11 ± 0.01 and 1.07 ± 0.01). However, maximum differences between levels of each factor were 0.73 and 0.65 SB for parity and herd, respectively. Over the 15 years studied, SB had increased by 0.2 piglets accompanied by an increase in the total numbers of piglets born per litter (TB) of ~0.5 piglets. This increase in SB was driven by higher occurrence of more than two SB within a single litter. The effect of TB on SB changed over time with solutions of 0.127 ± 0.002 and 0.150 ± 0.002 SB/TB in 1996 and 2010, respectively. Heritability estimates for SB ranged from 0.06 ± 0.01 to 0.09 ± 0.01 for alternative models and time periods. The unfavourable genetic correlation between SB and TB of 0.46 ± 0.03 based on all data available was slightly lower using only data from the first 5 years (0.38 ± 0.07) versus using data from the last 5 years (0.46 ± 0.06). However, this increase in phenotypic and genetic associations between SB and TB over time may be larger in populations that have observed a larger increase in TB.

Estimation of genetic parameters of fertility traits in Chinese Holstein cattle

2014 ◽  
Vol 94 (2) ◽  
pp. 281-285 ◽  
Author(s):  
Gang Guo ◽  
Xiangyu Guo ◽  
Yachun Wang ◽  
Xu Zhang ◽  
Shengli Zhang ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Genetic Correlations ◽  
Holstein Cattle ◽  
Calving Interval ◽  
Strongly Correlated ◽  
Multiple Trait ◽  
Chinese Holstein ◽  
Chinese Holstein Cattle ◽  
Fertility Traits ◽  
Estimation Of Genetic Parameters

Guo, G., Guo, X., Wang, Y., Zhang, X., Zhang, S., Li, X., Liu, L., Shi, W., Usman, T., Wang, X., Du, L. and Zhang, Q. 2014. Estimation of genetic parameters of fertility traits in Chinese Holstein cattle. Can. J. Anim. Sci. 94: 281–285. The objective of this study was to estimate genetic parameters for fertility traits in Chinese Holstein heifers and cows. Data of 20169 animals with 42106 records over a period of 10 yr (2001–2010) were collected from Sanyuan Lvhe Dairy Cattle Center in Beijing, China. Traits included age at first service (AFS), number of services (NS), days from calving to first service (CTFS), days open (DO), and calving interval (CI). Genetic parameters were estimated with multiple-trait animal model using the DMU software. Heritability estimates for AFS, NS, CTFS, DO and CI were 0.100±0.012, 0.040±0.017, 0.034±0.011, 0.053±0.019 and 0.056±0.014, respectively. Genetic correlations between traits observed ranged from −0.13 to 0.99. Genetic correlations between AFS with NS, CTFS, DO and CI were −0.31, 0.15, −0.13 and −0.15, respectively. Calving interval was strongly correlated with NS, CTFS and DO (0.49–0.99), and DO showed strong correlation with NS and CTFS (0.49 and 0.58, respectively). The genetic correlation between CTFS and NS was negative moderate (−0.25). Results were in range with previous literature estimates and can be used in Chinese Holstein genetic evaluation for fertility traits.

scholarly journals Contemporary methods of estimation of genetic parameters in broiler chicken populations

2012 ◽  
Author(s):  
Γεράσιμος Μανιάτης
Keyword(s):  
Broiler Chicken ◽  
Genetic Parameters ◽  
Estimation Of Genetic Parameters

Πραγματικά και προσομοιωμένα δεδομένα που ακολουθούσαν κανονική και διωνυμική κατανομή αναλύθηκαν χρησιμοποιώντας τη μέθοδο της υπό περιορισμό μέγιστης πιθανοφάνειας καθώς και δύο μεθόδους Bayes (MCMC και INLA). Τα αποτελέσματα της εργασίας δηλώνουν την χρησιμότητα της εφαρμογής των MCMC στη διερεύνηση συνδιακυμάνσεων μεταξύ τυχαίων επιδράσεων. Η μέθοδος INLA φαίνεται να αποτελεί μία εναλλακτική μέθοδο Bayes γρήγορη και χρήσιμη για ανάλυση δεδομένων που ακολουθούν κανονική κατανομή. Για την επιλογή του καταλληλότερου στατιστικού προτύπου ανάλυσης μία σειρά κριτηρίων έχει προταθεί. Εκτός από τα κριτήρια Akaike και BIC, στη συγκεκρίμενη μελέτη εφαρμόστηκε και το cAIC το οποίο λαμβάνει πιο αποτελεσματικά υπόψιν τους δραστικούς βαθμούς ελευθερίας και όπως προέκυψε από τις αναλύσεις είναι δυνατό να προτείνει διαφορετικά πρότυπο. Εξετάσθηκε η συνεισφορά των γενετικών επιδράσεων στο φαινόμενο του φυλετικού διμορφισμού του βάρους κρεοπαραγών ορνιθίων, χρησιμοποιώντας διμεταβλητά πρότυπα ανάλυσης αλλά και δευτερογενείς ιδιότητες που λάμβαναν υπόψη τη διαφορά και το λόγο των σωματικών βαρών αρσενικών και θηλυκών ατόμων. Για το σκοπό αυτό, χρησιμοποιήθηκε ένας μεγάλος αριθμός δεδομένων, αποτελούμενος από 203,323 ατομικές αποδόσεις σωματικών βαρών κρεοπαραγωγών ορνιθίων. Το καλύτερο πρότυπο περιελάμβανε προσθετικές γενετικές, μητρικές γενετικές και μητρικές περιβαλλοντικές επιδράσεις καθώς και τη συνδιακύμανση μεταξύ προσθετικών και μητρικών γενετικών επιδράσεων. Ο συντελεστής κληρονομικότητας δεν παρουσίασε διαφορές μεταξύ αρσενικών και θηλυκών (0.28 vs. 0.29). Μόνο ο συντελεστής συσχέτισης μεταξύ προσθετικών και μητρικών γενετικών επιδράσεων διέφερε ανάμεσα στα φύλα (-0.72 vs. -0.56 για αρσενικά και θηλυκά βάρη, αντίστοιχα), υποδεικύοντας έναν πιο έντονο ανταγωνισμό μεταξύ προσθετικών και μητρικών γενετικών επιδράσεων για τα αρσενικά. Τέλος, χρησιμοποιήθηκαν επιπλέον 35,595 αποδόσεις βαρών κρεοπαραγωγών ορνιθίων στις 35 ημέρες υπό δυσμενείς μικροβιακά συνθήκες για τη διερεύνηση της ύπαρξης αλληλεπίδρασης γονοτύπου περιβάλλοντος. Τα αποτελέσματα της μελέτης έδειξαν την ύπαρξη χαμηλού συντελεστή προσθετικής γενετικής συσχέτισης μεταξύ των δύο περιβαλλόντων, κυμαινόμενου μεταξύ 0,28 και 0,45 ανάλογα το πρότυπο, υποδηλώνοντας την ύπαρξη ισχυρής αλληλεπίδρασης γονοτύπου περιβάλλοντος για τη συγκεκριμένη ιδιότητα στον υπό εξέταση πληθυσμό.

scholarly journals Genetic parameters of reproductive traits in Tunisian Holsteins

2016 ◽  
Vol 59 (2) ◽  
pp. 209-213 ◽  
Author(s):  
Hafedh Ben Zaabza ◽  
Abderrahmen Ben Gara ◽  
Hedi Hammami ◽  
Borni Jemmali ◽  
Mohamed Amine Ferchichi ◽  
...  
Keyword(s):  
Genetic Correlation ◽  
Genetic Parameters ◽  
Genetic Parameter ◽  
Genetic Correlations ◽  
Reproductive Traits ◽  
Parameter Estimates ◽  
Calving Interval ◽  
Cattle Herds ◽  
Correlation Estimate ◽  
Fertility Traits

Abstract. Multi-trait Bayesian procedure was used to estimate genetic parameters for reproductive traits in Tunisian Holstein cows. A total of 31 348 lactations of the calving years 2005 to 2012 were analyzed. Fertility traits were the calving interval (CI), days open (DO), days to first insemination (DFI), days from first insemination to conception (FIC), and number of inseminations per conception (NI). Posterior means of heritabilities of CI, DO, DFI, FIC, and NI were 0.047, 0.03, 0.025, 0.024, and 0.069, respectively. Posterior means of repeatabilities of the same respective traits were 0.106, 0.094, 0.051, 0.036, and 0.17. Genetic correlations among female fertility traits were also computed. Calving interval and DO had the highest genetic correlation estimate (0.85) because they have overlapping genetic meanings. The lowest genetic correlation estimate (−0.25) was found between DFI and NI. Genetic parameter estimates are low and are even lower than those reported in most literature, implying that more focus should be put upon improving the management of reproduction in dairy cattle herds in Tunisia.

scholarly journals Groups and Individuals: Optical Flow Patterns of Broiler Chicken Flocks Are Correlated with the Behavior of Individual Birds

Animals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 568
Author(s):  
Sabine G. Gebhardt-Henrich ◽  
Ariane Stratmann ◽  
Marian Stamp Dawkins
Keyword(s):  
Optical Flow ◽  
Broiler Chicken ◽  
Average Length ◽  
Flow Patterns ◽  
Group Level ◽  
Positive Correlation ◽  
Water Test ◽  
Mean And Variance ◽  
The Mean

Group level measures of welfare flocks have been criticized on the grounds that they give only average measures and overlook the welfare of individual animals. However, we here show that the group-level optical flow patterns made by broiler flocks can be used to deliver information not just about the flock averages but also about the proportion of individuals in different movement categories. Mean optical flow provides information about the average movement of the whole flock while the variance, skew and kurtosis quantify the variation between individuals. We correlated flock optical flow patterns with the behavior and welfare of a sample of 16 birds per flock in two runway tests and a water (latency-to-lie) test. In the runway tests, there was a positive correlation between the average time taken to complete the runway and the skew and kurtosis of optical flow on day 28 of flock life (on average slow individuals came from flocks with a high skew and kurtosis). In the water test, there was a positive correlation between the average length of time the birds remained standing and the mean and variance of flock optical flow (on average, the most mobile individuals came from flocks with the highest mean). Patterns at the flock level thus contain valuable information about the activity of different proportions of the individuals within a flock.

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