Browsing by Author "Sanz, Albina"
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- Development of organs and tissues in lambs raised on Spanish mountain grasslandPublication . Álvarez-Rodríguez, Javier; Sanz, Albina; Joy, Margalida; Carrasco, Salomé; Ripoll, Guillermo; Teixeira, AlfredoThe present study was conducted to establish the pattern of body development in grass-raised Churra Tensina lambs. Forty-nine single male lambs were slaughtered at three body-weight intervals, according to the commercial categories of suckling (11.191.0kg), light (22.190.8 kg) and heavy lamb (32.092.9 kg). Non-carcass and carcass components were recorded and the half left carcasses were completely dissected. Lambs showed a low growth rate of main organs in relation to empty body weight (BW) (PB0.01). Skin fleece and liver accompanied the rest of mass growth (P 0.05). The allometric coefficients of forestomachs and large intestine were higher than that of the small intestine (PB0.05). Joints related to locomotion had early development (PB0.01), whereas those belonging to the trunk grew at faster rates than did carcass weight (PB0.01). The fatty tissues had increased growth coefficients (PB0.01), whereas bone and lean coefficients decreased (PB0.01) with increasing carcass weight. Intermuscular fat attained greater growth rates in lambs slaughtered at light BW than in heavy lambs (PB0.01). However, the former group displayed lower relative growth of pelvic-renal, subcutaneous and abdominal fat than the latter (PB0.01). This trait might reflect improved investment of dietary energy towards deposition of adipose tissue through the increased digestive tract capacity. L’e´tude devait pre´ciser comment se de´veloppe le corps des agneaux Churra Tensina engraisse´s a` l’herbe. Quarante-neuf agneaux maˆ les ont e´ te´ abattus a` trois poids corporels diffe´rents selon les cate´gories commerciales d’agnelet (11,191,0kg), d’agneau le´ger (22,19 0,8 kg) et d’agneau lourd (32,092,9 kg). Les auteurs ont consigne´ les parties de la carcasse et les autres parties puis entie`rement disse´que´ le coˆ te´ gauche de la carcasse. Les principaux organes des agneaux croissent lentement comparativement au poids de la carcasse vide (PB0,01). La peau et la laine ainsi que le foie suivent le reste de l’accroissement ponde´ ral (P 0,05). Les coefficients allome´triques du secteur gastrique ante´rieur et du gros intestin sont plus e´leve´ s que ceux de l’intestin greˆ le (PB0,05). Les articulations associe´es a` la locomotion se de´veloppent haˆ tivement (PB0,01) alors que celles du tronc croissent plus vite que le poids de la carcasse (PB0,01). Les tissus adipeux se caracte´ risent par un coefficient de croissance plus e´leve´ (PB0,01), tandis que les coefficients des os et de la viande maigre diminuent (PB0,01) a` mesure que le poids de la carcasse augmente. Le taux de croissance de la graisse intermusculaire est plus e´leve´ chez les agneaux le´gers que chez les agneaux lourds (PB0,01). Cependant, les sujets du premier groupe re´ve`lent une plus faible croissance relative de la matie`re grasse pelvique-re´nale, sous-cutane´e et abdominale que ceux du second groupe (PB0,01). Cette caracte´ristique pourrait traduire une meilleure utilisation de l’e´nergie des aliments pour le de´poˆt de tissu adipeux graˆ ce a` une capacite´ supe´rieure du tube digestif.
- Estimación de la composición de la canal de ternasco por ultrasonidos en canalPublication . Ripoll, Guillermo; Álvarez-Rodríguez, Javier; Sanz, Albina; Teixeira, Alfredo; Joy, MargalidaSe sacrificaron 129 corderos tipo Ternasco de las razas Churra Tensina y Rasa Aragonesa a un peso vivo entre 22 y 24 kg. Se midieron los espesores de grasa subcutánea y el ancho y profundidad del músculo en la 10ª vértebra torácica a tres distancias de la línea media dorsal por medio de ultrasonidos en la canal caliente. Estas mismas medidas se realizaron con calibre en la canal fría y se realizó la disección en músculo, grasa total y hueso. Las medidas de ultrasonidos y de canal fría se compararon y se desarrollaron ecuaciones de predicción de la composición de la canal. El objetivo de este trabajo fue estudiar la exactitud de las medidas de ultrasonidos realizadas en canal caliente y su utilidad para estimar la composición de la canal en el rango de pesos del cordero tipo Ternasco. Las medidas de ultrasonidos en canal subestimaron los espesores medidos en canal fría. Los espesores de grasa medidos por ultrasonidos con interfase tuvieron menor diferencia que los medidos sin interfase con el espesor de la grasa de la canal fría en cualquiera de los tres puntos usados. El peso de la canal caliente explicó en mayor porcentaje la composición de la canal. Para mejorar la fiabilidad de las ecuaciones sería necesario ampliar el rango de pesos utilizados.
- In vivo ultasonic measurements and live weight for predicting carcass quality in Churra Tensina mountain breed lambsPublication . Delfa, Rafael; Joy, Margalida; Sanz, Albina; Panea, Begoña; Álvarez-Rodríguez, Javier; Alberti, P.; Teixeira, AlfredoForty-six single male lambs ofChurra Tensina mountain breed with a live-weight ranging from 19.9 . to 24.4 kg ('Temasco' carcass commercial type) were scanned by ultrasound (ALOKAmodel SSD- 900, with a 7.5 MHz probe) to determine M. longissimus dorsi depth and subcutaneous fat thickness between the lOth-lith, 12th-13th dorsal vertebrae and 1st-2nd, 3rd-4th lumbar vertebrae. Lambs were slaughtered and carcasses were cooled at 4 °C for 24 h and halved. The left side was divided according to a standardised jointing procedure, based on six anatomical regions: shoulder, long leg, anterior ribs, ribs, flank and neck. Each joint was then disseCted into ,muscle, bone plus remainder and subcutaneous, inter-muscular, kidney and pelvic fat. Thein vivo ultrasound measureme~ts plus slaughter weight were fitted to predict carcass tissue composition by Stepwise regression analysis. All the developed models were highly significant (P
- In vivo ultrasonic measurements and live weight for predicting carcass quality in Churra Tensina mountain breed lambsPublication . Delfa, Rafael; Joy, Margalida; Sanz, Albina; Panea, Begoña; Teixeira, AlfredoForty six single male lambs of Churra Tensina mountain breed with a live weight ranging from 19.9 to 24.4 Kg producers of carcass type Temasco, were scanned by ultrasound (ALOKA model SSD-900, with a 7.5 MHz sounder) to determine M. Longissimus dorsi depth and subcutaneous fat thickness between the I Olh_l ]lh, 12th_13th dorsal vertebra and PI_2nd, 3rd_4lh lumbar vertebra. Lambs were slaughtered after 24 h. fasting. Carcasses were cooled at 4' C for 24 h. and halved. The left side was divided according to a standardised jointing procedure, based on six anatom ically regions: shoulder. long leg, anterior ribs, ribs, flank and neck. Each joint was then dissected into muscle, bone plus remainder and subcutaneous, inter-muscular, kidney and pelvic fat. The in vivo ultrasound measurements plus slaughter weight were fitted to predict carcass tissue composition by Stepwise regression analysis. All the developed models were highly significant (P