Impact of high-yielding foreign breeds on the Spanish dairy sheep industry

Ugarte, E.; Ruíz, R.; Gabiña, D.; Heredia, I. Beltrán de

doi:10.1016/s0301-6226(01)00235-4

Cited by 58 publications

(40 citation statements)

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“…A produção diária de leite até os 133 dias de lactação foi maior (P<0,05) nas ovelhas tratadas com ocitocina. Os valores encontrados neste estudo, principalmente nas ovelhas tratadas com ocitocina (1,07 kg), foram próximos aos observados por Ugarte et al (2001) em ovelhas especializadas Lacaune, Awassi e Assaf, que apresentaram produções diárias de 1,9; 1,5 e 2,0 L, respectivamente. A menor produção de leite das ovelhas do grupo controle pode ser atribuída à falha no reflexo de ejeção do leite, pois, como foram ordenhadas pela primeira vez, o manejo de ordenha causou-lhes estresse, prejudicando a ação da ocitocina endógena sobre as células mioepiteliais dos alvéolos.…”

Section: Resultsunclassified

Produção, composição e rendimento em queijo do leite de ovelhas Santa Inês tratadas com ocitocina

Ribeiro¹,

Pérez²,

Carvalho³

et al. 2007

R. Bras. Zootec.

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RESUMO -Objetivou-se avaliar a produção, a composição e o rendimento (na fabricação de queijos) do leite de ovelhas Santa Inês tratadas ou não com ocitocina. Os animais foram mantidos em regime de confinamento e receberam uma dieta com 12% de PB e 65% de NDT. As ovelhas foram distribuídas em dois tratamentos: ordenha manual com injeção endovenosa de três UI de ocitocina e ordenha manual sem injeção de ocitocina (grupo controle). Realizou-se uma ordenha diária, de modo que, até a desmama, as ovelhas permaneceram diariamente com os cordeiros durante 14 horas. Os cordeiros foram desmamados aos 60 dias e as ovelhas continuaram sendo ordenhadas uma vez ao dia até o final da lactação. Foram coletadas amostras de leite para análise dos teores de gordura, de sólidos totais e de sólidos desengordurados. A duração média da lactação foi de 225±27,24 e 210±38,77 dias para as ovelhas controle e tratadas com ocitocina, respetivamente. Até os 133 dias de lactação, o tratamento com ocitocina (141,63±51,52 kg) foi superior ao controle (89,39±16,65 kg), entretanto, durante todo o período de lactação, não diferiu (169,64 ± 71,05) do controle (119,72±32,73). As porcentagens de gordura (5,84±0,44 e 4,96±0,47), sólidos totais (17,40±0,42 e 16,18±0,57) e sólidos desengordurados (11,57±0,15 e 11,22±0,25) no leite foram influenciadas pela aplicação de ocitocina. Os resultados revelaram diferença significativa para as ovelhas tratadas com ocitocina, as quais apresentaram maior produtividade e, inclusive, melhor composição química do leite. A aplicação de ocitocina é recomendada para animais não adaptados à rotina de ordenha. O leite das ovelhas Santa Inês apresentou rendimentos de 4,80; 8,29 e 5,99 L/kg para os queijos tipo azeitão, pecorino e roquefort, respectivamente.Palavras-chave: gordura, hormônio, lactação, ovino Effects of oxytocin on milk yield and composition of Santa Inês ewesABSTRACT -The objective of this trial was to investigate the effects of oxytocin on milk yield and composition and on cheese yield of Santa Inês sheep receiving a diet containing 12% CP and 65% TDN. Animals were maintained in pens and were assigned to one of the following two treatments: hand milking plus an intravenous injection of 3 IU of oxytocin or hand milking without oxytocin injection (control group). Ewes were milked daily and remained with their lambs for a daily period of 14 hours until weaning; lambs were weaned at 60 days of age and ewes still milked once a day until the end of lactation. Milk samples were collected for analysis of fat, total solids, and solids non-fat. Lactation length averaged 225±27.24 and 210±38.77 for control and oxytocin-treated ewes, respectively. Ewes receiving oxytocin yielded more milk (141.63±51.52 kg) than those on the control group (89.39±16.65 kg) until 133 days of lactation; however, total milk yield on the entire lactation did not differ significantly comparing oxyitocin-treated (169.64 ± 71.05) with control (119.72±32.73) animals. Milk contents of fat (5.84±0.44 and 4.96±0.47), total solids (17.40±0.42 and 16....

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Section: Resultsunclassified

Produção, composição e rendimento em queijo do leite de ovelhas Santa Inês tratadas com ocitocina

Ribeiro¹,

Pérez²,

Carvalho³

et al. 2007

R. Bras. Zootec.

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“…The breed in Spain is increasing with 700 000 heads in 2001 (Ugarte et al 2001). The Assaf sheep breed was created in Israel by cross-breeding the East Friesian (Milchschaf) with the Awassi breed (Goot 1986).…”

Section: Introductionmentioning

confidence: 99%

Association between body and udder morphological traits and dairy performance in Spanish Assaf sheep

Pérez-Cabal

Legaz²,

Cervantes

et al. 2013

Arch. Anim. Breed.

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The relationship between 17 body and 8 udder measurements and phenotypic dairy performance were studied using information from 280 Spanish Assaf ewes from 2 to 4 years old belonging to 18 flocks. The influence of the environmental area on the dairy traits was assessed by fitting a fixed model including the flock effect and the age effect. A factor analysis was also carried out to determine the lowest number of independent factors that account for most of the variation in the traits. The flock was statistically significant for performance trait and predicted breeding value (PBV) while the age was only significant in 150 days standardized milk yield (MY150) and daily milk yield (DMY). In general, not much association was found between morphological and dairy performance traits. Few body traits showed significant phenotypic correlations; mainly those related to height, diameters, ears and tail, with the latter being the most correlated but unfavourable for DMY and PBV. Among udder conformation, udder depth and length were the most correlated traits to milk production, while deep udders and short teats were related to lower somatic cell counts. The different traits were classified for analyses into six factors relating mainly to: live weight; production and udder traits; cheese production; stature; teats and udder health; and udder dimensions. Trade of animals was concluded to be unreasonably based on morphological or even on performance traits. The participation of breeders in an appropriate breeding scheme based on accurate genetic evaluations is encouraged.

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“…Recent reports (Ugarte et al, 2001) estimated that 45% of the roughly 5 million head of sheep exploited for dairy in Spain are foreign breeds (mainly Assaf, Awassi and Lacaune) or crosses. The Assaf sheep breed was formed in Israel by crossbreeding the East Friesian (Milchschaf) with the Awassi breed (Goot, 1986).…”

Section: Introductionmentioning

confidence: 99%

Genetic relationships between Spanish Assaf (Assaf.E) and Spanish native dairy sheep breeds

Legaz¹,

Álvarez

Royo

et al. 2008

Small Ruminant Research

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a b s t r a c tAt present, the Assaf is the main dairy sheep in Spain. The Spanish Assaf (Assaf.E) was formed by male-mediated absorption of native Spanish sheep. Here we assess the genetic relationships among the Assaf.E and major native Spanish dairy breeds using microsatellites to contribute to the knowledge of the formation and within-population genetic variability of the breed. Blood samples from 44 unrelated Assaf.E individuals from 23 different Assaf.E flocks spread throughout 6 different Spanish provinces were obtained and genotyped using 14 microsatellites. Up to 312 additional samples belonging to the Awassi and Milchschaf sheep breeds and to six native Spanish dairy sheep breeds (Castellana, Churra, Latxa, Manchega, and Rubia de El Molar) as well as samples from Merino individuals to be used as the outgroup were also analysed observed (H o ) and expected (H e ) heterozygosity, rarefacted number of alleles per locus and distances based on molecular coancestry information were computed. Probabilities of assignment of the Assaf.E individuals to native Spanish dairy sheep breeds and cryptic genetic structure in the whole dataset were also assessed. It can be concluded that the Assaf.E breed has low genetic variability and high genetic distance with respect native Spanish dairy sheep breeds. From our results, the formation of the Assaf.E breed basically occurred via the absorption of individuals belonging to the Entrefino type, particularly to the Castellana and Manchega populations. Furthermore, Churra individuals may have participated in the formation of the Assaf.E breed at an early moment of the introduction of the breed into Spain.

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Impact of high-yielding foreign breeds on the Spanish dairy sheep industry

Cited by 58 publications

References 1 publication

Produção, composição e rendimento em queijo do leite de ovelhas Santa Inês tratadas com ocitocina

Produção, composição e rendimento em queijo do leite de ovelhas Santa Inês tratadas com ocitocina

Association between body and udder morphological traits and dairy performance in Spanish Assaf sheep

Genetic relationships between Spanish Assaf (Assaf.E) and Spanish native dairy sheep breeds

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