Fecha/hora: 13/05/2024 00:13:58

Biblioteca(s): 	INIA Las Brujas.	
Fecha corriente: 	22/11/2023	
Fecha de la última actualización: 	22/11/2023	
Autoria: 	CIAPPESONI, G.; MARQUES, C. B.; NAVAJAS, E.; PERAZA, P.; CARRACELAS, B.; VERA, B.; VAN LIER, E.; DE BARBIERI, I.; SALADA, S.; MONZALVO, C.; CASTELLS, D.	
Afiliación: 	CARLOS GABRIEL CIAPPESONI SCARONE, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; CAMILA BALCONI MARQUES, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; ELLY ANA NAVAJAS VALENTINI, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; PABLO PERAZA DOS SANTOS, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; EMERITA BEATRIZ CARRACELAS MARQUEZ, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; BRENDA VERA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; E. VAN LIER, Departamento de Producción Animal y Pasturas Facultad de Agronomía Universidad de la República Avda. Garzón 780, Montevideo 129 00, Uruguay; LUIS IGNACIO DE BARBIERI ETCHEBERRY, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; S. SALADA, Centro de Investigación y Experimentación Dr Alejandro Gallinal Secretariado Uruguayo de la Lana Ruta 7 km 140, Cerro Colorado, Florida 94000, Uruguay; CARLOS ENRIQUE MONZALVO CAMPAÑA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; D. CASTELLS, Centro de Investigación y Experimentación Dr Alejandro Gallinal Secretariado Uruguayo de la Lana Ruta 7 km 140, Cerro Colorado, Florida 94000, Uruguay.	
Título: 	Breeding for sheep parasite resistance in extensive production systems in Uruguay: From phenotype to genotype.	
Complemento del título: 	Advances in biotechnologies for improving livestock breeding and feeding.	
Año de publicación: 	2023	
Fuente/Imprenta: 	In: Viljoen, G., Garcia Podesta, M. & Boettcher, P. (eds). 2023. International Symposium on Sustainable Animal Production and Health - Current status and way forward. Vienna, Austria, 28 June to 2 July 2021. Rome, FAO. Pp.224-236.  https://doi.org/978-92-5-137052-0	
ISBN: 	978-92-5-137052-0	
DOI: 	https://doi.org/978-92-5-137052-0	
Idioma: 	Inglés	
Contenido: 	ABSTRACT.- Gastrointestinal parasites (GIP) are one of the main causes of economic losses for sheep farmers worldwide. The need for alternative control measures comes from increasingly critical anthelmintic resistance. One alternative is to include genetic resistance to GIP in breeding programmes, by selecting for worm faecal egg count (FEC). Using this selection criterion since 1994, Uruguay has included genetic resistance to GIP in the genetic evaluation of Australian Merino and Corriedale breeds. Although FEC has been the most used selection criterion to evaluate resistant animals, data recording is time-consuming and costly and requires a nematode infection challenge. Selecting parasite resistance without the need for nematode challenge would be a less expensive alternative approach without compromising the wellbeing of the animals. Moreover, other indicator traits such as packed cell volume (PCV), FAMACHA© score, body condition score (BCS) could be included to increase genetic improvement. This paper describes the current selection programmes for GIP-resistant sheep, data recording, new criteria evaluation, selection nuclei, development and use of molecular tools, projects, as well as further approaches to enhance and improve genetic progress in Uruguay. Current databases enabled various estimations and demonstrated that genetic progress can be achieved. We can highlight the following results: (i)
FEC heritability values ranging from 0.15 to 0.21; (ii) high genetic correlation between FEC in ewes at spring rise and FEC in lambs at post-weaning (0.81 ± 0.11); (iii) genetic selection by FEC is effective in different environments (low or high worm environments) and the genetic correlation
between environments is high (0.87 ± 0.04); (iv) there is a moderate favorable genetic correlation between FEC and FAMACHA©; (v) the Corriedale susceptible line had up to 3.3 times higher average of FEC than resistant line; (vi) INIA Corriedales showed better genetic merit for twinning rate, greasy fleece weight, fibre diameter, and body weight at shearing in comparison with the resistant line of SUL; and (vii) in Australian Merino, it has been possible to generate heavier progeny producing more and finer wool, and also more resistant to GIP. Moreover, generating
reference populations for molecular studies and selection nuclei is also very important. All strategies described in this study aim at improving the genetic resistance of sheep to GIP.	
Palabras-Clave: 	FEC; Haemonchus contortus; SISTEMA GANADERO EXTENSIVO - INIA.	
Thesagro: 	CORRIEDALE; MERINO; SNP.	
Categoría del tema: 	L10 Genética y mejoramiento animal	
URL: 	http://www.ainfo.inia.uy/digital/bitstream/item/17421/1/Ciappesoni-et.al-2023-FAO-cc2530en.pdf	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (103723-1) - PXI - PL - DD - Int.Symp.Sust.An.Prod.&Health/FAO/2023 -  -  - DIS