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Pedigree Analysis of Cinta Senese and Mora Romagnola Breeds

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Pedigree Analysis of Cinta Senese and Mora Romagnola Breeds 8th International Symposium on the Mediterranean Pig, Slovenia, Ljubljana, October 10th−12th, 2013. COBISS: 1.08 Agris category code: L10 PEDIGREE ANALYSIS OF CINTA SENESE AND MORA ROMAGNOLA BREEDS Alessandro CROVETTI 1, Francesco SIRTORI 1, Carolina PUGLIESE 1, Oreste FRANCI 1, Riccardo BOZZI 1 ABSTRACT During the last century, all the Italian pig breeds suffered a narrow bottleneck. Nowadays, only six Italian local breeds are still reared in Italy and only Cinta Senese and Mora Romagnola breeds can account on rather complete and reliable pedigree. The aim of the work was to assess both genetic variability and genetic contribution of founders and herds to the present populations for these breeds in order to explore the possibility to set up a selection of breeding animals. The results showed that both breeds still need an accurate mating management in order to contain inbreeding levels and at the moment no selection strategies could be planned. Key words: Cinta Senese pig / Mora Romagnola pig / probability of gene origin / inbreeding / genetic diversity 1 INTRODUCTION 2 MATERIALS AND METHODS Nowadays, only six local breeds are still reared in Genealogical information recorded in CS and MR Italy and keep a herdbook. These breeds are: Mora Roma- herdbook were obtained from ANAS (Associazione Na- gnola, Apulo-Calabrese, Sarda, Nero Siciliano, Casertana zionale Allevatori Suini, Roma). CS herdbook includes and Cinta Senese. Only Cinta Senese (CS) and Mora Ro- pedigree registrations since 1972 for a total of 53,608 magnola (MR) pigs have sufficiently complete pedigree animals; MR herdbook was instituted more recently data which allow genetic analyses producing realistic re- and contains genealogical information since 1985 for sults. CS is the most important Italian autochthonous pig 5,933 animals. Ancestors with both parents unknown were considered founders; if one parent was known, the breed. In 1996, a genetic management program started unknown parent was considered a founder. To charac- and a reduction of the inbreeding level of the animals terize CS and MR populations, pedigree completeness (from 0.21 in 1995 to 0.14 in 2003) was achieved (Franci (MacCluer et al., 1983) was assessed; depth of pedigree et al., 2004). The MR breed has the origin in Emilia Ro- completeness remarkably influences the accuracy of in- magna and at the end of the last century, it was almost breeding coefficients. Moreover, the generation interval extinct. Only 12 animals were found in 1998 (Fortina et was defined as the average age of parents at the time al., 2005). Aim of the work was to analyze the pedigree when selected progeny was born, and averaged. At herd information of CS and MR breeds in order to calculate level, the following parameters were calculated: effec- the available genetic variability in terms of inbreeding tive number of herds (Hs) supplying fathers (Robertson, levels, founders and herds contributions. Interpretation 1953) and genetic representation of herds at population of the results would allow to assess if it is still needed to level. This parameter was assessed summing up Boichard work mainly on inbreeding control or/and if it is possible et al. (1997) contribution values of the ancestors belong- to set up a genetic improvement program. ing to each herd. Finally, effective number of founder 1 Department of Agrifood Production and Environmental Sciences - Animal Science Section - Università degli Studi di Firenze Via delle Cascine, 5 50144 FIRENZE, Italy, e-mail: [email protected] Acta argiculturae Slovenica, Supplement 4, 41–44, Ljubljana 2013 A. CROVETTI et al. Figure 1: Pedigree completeness Table 2: Eff ective number of herds supplying boars and eff ective herds (fh) was estimated. Concentration of the gene ori- gin was assessed by estimating the following criteria: ef- number of founder herds fective number of founders (f ) (Lacy, 1989) and the ef- e Breed CS MR fective number of ancestors (fa) (Boichard et al., 1997). Moreover, inbreeding coeffi cient (F) and eff ective popu- Actual number of herds producing boars 190 43 Eff ective number of herds supplying boars (H ) 23.86 18.98 lation size (Ne) were computed.; In shallow pedigrees, Ne s (calculated as 1/2∆F) fi ts poorly with the real population Eff ective number of founder herds (Fh) 3.5 1.2 giving an overestimated value of Ne. To better character- ize Ne, the regression coeffi cient (b) of the individual in- breeding coeffi cient was estimated over: 1) the number Average generation intervals are 2.51 and 2.01 for of full generations of ancestors traced, 2) the maximum CS and MR, respectively. MR is still in a phase of demo- number of generations traced, 3) the equivalent complete graphic growth, so a higher number of piglets is selected generations. Th e regression coeffi cient (b) was consid- as breeding animals. ered as the average increase in inbreeding between two Th ere is a large discrepancy between the actual and the eff ective number of herds producing boars (Table 2). generations. Consequently, the Ne is estimated as half of regression coeffi cient (1/2b). Th e diff erence is more pronounced in CS breed (190 to 23.86) than in MR breed (43 to 18.98). Th e number of eff ective number of founder herds (3.5 in CS and 1.2 in Table 1: Measures of pedigree completeness MR) is very small in both breeds. All these results the evi- Breed CS MR dence that both breeds suff er a high concentration of the Mean Maximum Generations 14.02 9.44 origin of the breeding animals. Th is makes these breeds Mean Complete Generations 4.62 3.75 rather weak in genetic terms. Th e risk is even more evi- dent when considering the large unbalanced contribu- Mean Equivalent Generations 7.83 5.98 tion of herds to the gene pool (Table 3): In both breeds, only fi ve herds represent more than 90% of the total ge- 3 RESULTS netic variability (99.7% in MR). In MR breed, almost all the variability is provided by one herd (92.4%) but also Pedigrees completeness is reported in Fig. 1. CS in CS more than 69% of variability is provided by two breed shows a deeper pedigree that is quite complete un- herds only. til the sixth generation; while MR breed has a shallow Th e total number of founders is noticeably higher pedigree with complete information only for the fi rst than the eff ective number of founders in both breeds. At generation and a huge decline starting from the sixth the beginning, both herdbooks were opened so all ani- generation. mals with the right morphological characteristics were Regarding the number of mean maximum genera- enrolled even with unknown parents. Th is practice led tions traced (Table 1) CS herdbook has a wider depth of to an overestimation of the total number of founders. almost fi ve generations; the mean of com- plete generations is 4.62 in CS and 3.75 in Table 3: Contribution of the most important herds (%) to genetic variability MR. Th e equivalent number of generations Cumulated was 7.83 in CS and 5.98 in MR populations; Breed Herd 1 Herd 2 Herd 3 Herd 4 Herd 5 Contribution these values are similar to those found in some French local breeds (Maignel et al., CS 46.4 23.1 6.7 9.1 5.1 90.5 2001). MR 92.4 3.1 2.5 1.0 0.6 99.8 42 Acta agriculturae Slovenica, Supplement 4 – 2013 PEDIGREE ANALYSIS OF CINTA SENESE AND MORA ROMAGNOLA BREEDS Table 4: Contribution of major ancestors to the genetic variability of inbreeding in MR was even Breed CS MR higher at the beginning and did not reduce much (0.34) in the pe- Number of ancestors contributing to 50% of the genetic variability 4 1 riod observed, due to the reduced Highest contribution of single ancestor 0.22 0.57 genetic base and the high relat- edness among breeding animals. Contrary, the eff ective number of founders (fe) and ef- Anyway, the inbreeding in MR breed is decreasing. fective number of ancestors (fa) describe more realisti- Table 5 reports the percentage of matings between cally the contribution of founders/ancestors to the actual close relatives. gene pool. In CS, fe (11) and fa (10) values were similar Eff ective population size (Table 6) estimated by to some French local breeds (Maignel et al., 2001), while the regression coeffi cient (b) over the equivalent com- fe (3) and fa (2) values were very low in MR. Small diff er- plete generations were 40.32 in CS and 10.87 in MR. Th e Figure 2: Changes of the average inbreeding coeffi cient ence between fe and fa can be appreciated in both breeds: Food and Agriculture Organization of the United Na- it is probably due to the fact that bottlenecks have been tions (FAO, 2000) suggested that Ne for a breed should be occurred before herdbooks reopening. Four ancestors maintained above 50, even though Meuwissen and Woo- (Table 4) contribute to 50% of the genetic variability in liams (1994) indicated a minimum range for Ne of 31 to the present population in CS, while only one ancestor 250 to maintain population fi tness. Eff ective population explains 57% of the genetic variability in MR (Table 4). size in both breeds is clearly under the threshold defi ned by FAO. Th us, results indicate that both breeds are still Table 5: Percentage of mating between close related animals (%) suff ering because of huge demographic collapse occurred in the last century. Between full Between half Breed sibs sibs Parent-off spring CS 1.47 5.87 6.54 4 CONCLUSIONS MR 5.06 14.68 8.51 CS pedigree is rather complete and deep, on the contrary MR pedigree is shallower and more incomplete.
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