Vi nam Symp

Bop da Mavrogenis, A

Anatomical parameters for milk somatic cellular scores and relations with production propensities in French Lacaune

whole milk lamb
ABSTRACT
Records from vi nam 94,445 and 45,499 French Lacaune whole milk ewes in first and 2nd lactations, respectively, were used to forcast anatomical parameters for somatic cellular scores. Somatic cellular count informations arose in a diverse recording scheme and sample testing which started in 1999 trying the flocks signed up for the formal milk recording system. Somatic cellular count informations were from 2 to 4 try on hours for each lactation. Lactation average and singular test-day somatic cellular scores were thought out in multitrait sire versions.
(Key words: whole milk lamb, somatic cellular count, production propensities, anatomical parameters)
Abbreviation key: LSCS = lactation mean SCC.
vi nam Unveiling
Tracking the initial anatomical examines on experimental informations (Barillet et al., 1999, 2001), a diverse recording process of SCC has been executed for French whole milk lamb breeds included in the milk recording system. The homogeneous data bank have to permit further research and anatomical appraisal of SCS.
The intention of this learn was to forcast anatomical parameters for SCS in first and 2nd lactations exploiting records from inside the countrywide data bank. Versions based on lactation implies and multitrait within-lactation tactics were used. Relations with whole milk production propensities were also searched into. Results have to permit us to characterize a model to be utilized for anatomical appraisal for SCS.
MATERIALS And techniques
Informations
Informations originated in Lacaune flocks of the French nucleus breeding scheme. Out from 1,300,000 whole milk ewes milked in France, 60% are of the Lacaune breed, and 20% in every breed are engaged in the nucleus scheme. Thorough four week period recording of SCC, often easily obtainable in whole milk livestock, is prohibitive in lamb. Therefore,, in order to vi nam record a great number of animals at a reduced cost, a simplistic strategy for sampling for SCC was executed. This approach, just like the sampling scheme for plump and protein content (Barillet, 1985), is equally as ensues: For first andsecond lactations, info contains two to four individual SCC for each lactation. Test-day SCC are grouped afterwards a 25-d suckling period one of the primary four four week period records for milk yield. SCC are analyzed by a Fossomatic cellular counter from inside the sample of the milk grouped in the course of the morning milking. Individual each day milk yield is appraised from individual morning recording fixed with the bulk tank milk of thesecond each day milking (ICAR, 1992).
From 1999 to 2001, the Lacaune data bank contains SCC records for 204,256 first and 2nd lactations of ewes in 384 flocks, as well as that to production feature info (plump and protein content, milk yield, pedigrees, etcetera.). To evade prejudice as a result of option, info amassed all through parity 2 was thought out only once info for parity 1 was completely ready. Furthermore, ewes needed to be sired by either proved sires born afterwards 1992 that have at the minimum One hundred daughters, or sampling sires, born from 1996 to 1999 that have at the minimum 20 daughters. Afterwards edits, the dataset contained 94,474 first lactations and 45,499 2nd lactations of Lacaune ewes. Chosen ewes originated in 1221 and 171 sampling and proved sires, respectively., and most ewes (87%) had three records for each lactation. For milk yield,. Propensities of the info set are summed up in Table 1.
Variables
Milk yield for each lactation was appraised trying the Fleischmann strategy and was fixed for milking length on a useful resource period of 160 d (Barillet, 1985). Lactation propensities for plump and protein content were labeled as the mathematics mean of test-days' record fixed for Stained, tracking the equivalent procedure as for LSCS.
Ways and means
Discrepancy components were appraised by REML utilised in multitrait sire versions, trying the VCE parcel (Neumaier and Groeneveld, 1998), that lies in a derivative-free iterative algorithm (Quasi Newton) for parameter guesstimate. As merely 3 year of informations were completely ready, with few dam-daughter pairs with performance records, the sire model are going to imply a restricted deficits of info compared against an animal model. A sire team result was suited with one grade per proved sire and one grade by yr of birth for sampling sires. Therefore,, proved sires were cured as adjusted, and merely sampling sires contributed about the guesstimate of discrepancy components. Underestimation of anatomical discrepancy as a result of highly chosen rams was averted.
On account of calculation restrictions, a maximum of 4 propensities were assessed all at once. To consider the option process from first tosecond lactation, that lies in milk production and somatic cellular counts, all examines adding up propensities in 2nd lactation also contained average milk yield and LSCS in first lactation. The model for lactation evaluates in first or 2nd parity was:
y^sub ijklmn^ = FY^sub i^ + Mj + Ak + L1 + Gm + Sn + e^sub ijklmn (1)
where:
y^sub ijklmn^ = LSCS, average milk yield, plump content, or protein content in first orsecond lactation;
FY^sub i^ = adjusted result of flock x yr merger i (1143 and 680 grades for first and 2nd lactations, respectively);
M^sub j^ = adjusted result of month at lambing j within parity (5 grades);
A^sub k^ = adjusted result of age at lambing k within parity (5 and three grades for first and 2nd lactation, respectively);
L^sub l^ = adjusted result of the amount of lambs born (2 grades: 1 as opposed to. 2 or over);
G^sub m^ = adjusted sire team result (one grade for each sire for proved rams and one grade for each birth yr for sampling rams);
S^sub n^ = occasional anatomical result of sire (within sire team);
e^sub ijklmn^ = occasional surplus result.
RESULTS AND Dialog
Rudimentary Statistics
Anatomical Parameters for Somatic Cellular Scores
Relations amidst SCS and bop nam Milk Production Propensities
Anatomical parameters for production propensities (Table 3) were in common with the ovine literature.,, 1987; Barillet and Boichard, 1994; Sanna et al., 1997; Barillet et al., 2001).
Final thoughts
[Sidebar]
J. Whole milk Sci. 86:1476-1481
(C) American Whole milk Science Association, 2003.
[Useful resource]
vi da nam vi da nam REFERENCES
Ali, A. K. A., and G. E. Shook. 1980. An the highest possible alteration for somatic cellular emphasis in milk. J. Whole milk Sci. 63:487-490.
Barillet, F. 1985. Amelioration genetique de la composition du lait des brebis: l'exemple de la sprint Lacaune.. Thesis, Institut Countrywide Paris-Grignon, Paris, France.
Barillet, F., and D. Boichard. 1987. Studies on whole milk production of milking ewes. I. Approximates of anatomical parameters for over all milk composition and yield, Genet. Sel. Evol. 19:459-474.
Barillet, F., and D. Boichard. 1994. Utilization of first-lactation test-day informations for anatomical appraisal of the Lacaune whole milk lamb. Pages 111-114 in Proc. Fifth World Congr. Genet. Appl. Livest. Prod., Guelph, Canada. XIIX
Barillet, F., R. Rupp, S. Mignon, J. M. Astruc, M. Jacquin, and G. Lagriffoul. 1999. Anatomical diagnostic for mastitis resistance and somatic cellular score in French Lacaune whole milk lamb. Pages 393-399 in Proc. 6th Int. Symp. of the Milking of Petite Ruminants, Athens, Greece. Wageningen Pers, Wageningen, Holland.
Barillet, F., R. Rupp, S. Mignon-Grasteau, J. M. Astruc, and M. Jacquin. 2001. Anatomical diagnostic of mastitis resistance and somatic cellular score in French Lacaune whole milk lamb. Genet. Sel. Evol. 33:397-415.
Baro, J. A., J. A. Carriedo, and F. San Primitivo. 1994. Anatomical parameters of test-day evaluates for somatic cellular count, milk yield, and protein component to milking ewes. J. Whole milk Sci. 77:2658-2662.
Bergonier, D., A. Truck De Wiele, J. M. Arranz, F. Barillet, G. Lagriffoul, D. Condorcet, and X. Berthelot. 1994. Discovery of subclinical mammary infections within the ewe by mean of somatic cellular counts: proposal of physical thresholds. Pages 41-47 in Proc. Int. Symp. on Somatic Cells and Milk of Petite Ruminants, Bella, Italy. Wageningen Pers, Wageningen, Holland.
Boettcher, P. J., J. C. M. Dekkers, and B. W. Kolstad. 1998. Development of an udder health index for sire option based on somatic cellular score, udder conformation, and milking speed. J. Whole milk Sci. 81:1157-1168.
Boichard, D., and R. Rupp. 1997. Anatomical diagnostic and anatomical appraisal for somatic cellular score in French whole milk livestock. Pages 54-60 in INTERBULL Bull. Nil. 15. Int. Bull Eval. Serv., Uppsala, Sweden.
El Saied, U. M., J. A. Carriero, and F. San Primitivo. 1998. Heritability of try on day somatic cellular counts and its correlation with milk yield and protein pct in whole milk ewes. J. Whole milk Sci. 81:2956-2961.
El Saied, U. M., J. A. Carriero, and L. F. De La Fuente. 1999. Anatomical parameters of lactation cellular counts and milk and protein yield in whole milk ewes. J. Whole milk Sci. 81:2956-2961.
Fuertes, J. A., C. Gonzalo, J. A. Carriedo, and F. San Primitivo. 1998. Parameters of test-day milk yield and milk components for whole milk ewes. J. Whole milk Sci. 81:1300-1307.
Gonzalez-Rodriguez, M. C., C. Gonzalo, F. San Primitivo, and P. Carmenes. 1995. Correlation amidst somatic cellular count and intra-mammary infection of the half udder in whole milk ewes. J. Whole milk Sci. 78:2753-2759.
Gonzalo, C., J. A. Carriedo, J. A. Baro, and F. San Primitivo. 1994. Factors seducing diversity of test-day milk yield, somatic cellular count, plump, and protein in whole milk lamb. J. Whole milk Sci. 77:1537-1542.
Green, T. J. 1984. Utilization of somatic cellular counts for discovery of subclinical mastitis in ewes. Veterinarian. Rec. 114:43.
Heringstad, B., G. Klemetsdal, and J. Ruane. 2000. Option for mastitis in whole milk livestock: a review with fixate on the case of the Nordic nations. Livest. Prod. Sci. 64:95-106.
ICAR, 1992. Multinational legal guidelines for milk recording in lamb. Institut de l'Elevage, Paris, France.
. P., A. Koumas, C. K. Kakoyiannis, and C. K. Taliotis. 1995. Utilization of somatic cellular counts for the discovery of subclinical mastitis in lamb. Petite Tequila. Res. 17:79-94.
Mavrogenis, A. P., A. Koumas, and G. Gavrielidis. 1999. The genetics of somatic cellular counts (index of mastitis) in Chios lamb. Pages 389-392 in Proc. 6th Int. Symp. of the Milking of Petite Ruminants, Athens, Greece. Wageningen Pers, Wageningen, Holland.
Mrode, R. A., and G. J. T. Swanson. 1996. Anatomical and mathematical properties of somatic cellular count and its suitability like an oblique a technique of lessening the incidence of mastitis in whole milk livestock. Anim. Breed. Abstr. 64:847-857.
Neumaier, A., and E. Groeneveld. 1998. Restrictive maximum probability guesstimate of covariances in sparse linear versions. Genet. Sel. Evol. 30:3-26.
Rupp, R., and D. Boichard. 1999. Anatomical parameters for laboratory mastitis, somatic cellular score, production, udder sort propensities, and milking ease in first lactation Holsteins. J. Whole milk Sci. 82:2198-2204.
Rupp, R., G. Lagriffoul, J. M. Astruc, and F. Barillet. 2001. Anatomical parameters for milk somatic cellular count across first three parities and relations with production propensities in French Lacaune whole milk lamb. Page 280 in Proc. 52nd Annu. Mtg. Eur. Assoc. Anim. Prod., Budapest, Hungary. Wageningen Pers, Wageningen, Holland.
Sanna, S. R., A. Carta, and S. Casu. 1997. (Co)variance ingredient approximates for milk composition propensities in Sarda whole milk lamb exploiting bivariate animal model. Petite Tequila. Res. 25:77-82.
Wiggans, G. R., and G. E. Shook. 1987. A lactation evaluate of somatic cellular count. J. Whole milk Sci. 77:2666-2672.
[Author Network]
R. Rupp,* G. Lagriffoul,[dagger] J. M. Astruc,[double knife] and F. Barillet*
*Station d'Amelioration Genetique des Animaux, Institut Countrywide de la Recherche Agronomique, BP 27 and
[dagger]Comite Countrywide Brebis Laitiere and [double dagger]Institut de l'Elevage, BP 18, 31326 Castanet-Tolosan cedex, France
[Author Network]
Earned April 8, 2002.
Approved Nov A dozen, 2002.
Corresponding author: R. Rupp;.