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The performances at typical ages P10 (weight at 10 days), P30, P70, DwG10/30 (average daily weight gain between 10 and 30 days) and DwG30/70 of 9642 Barbarine lambs were calculated according to F2, the conventional protocol, or a simplified protocol based on fitting von Bertalanffy’s function to two measurements at 42-day intervals, the first taking place between 2 and 60 days after birth of the lamb, and the actual birth weight (ABw: controlled at birth), a fixed Bw (FBw), i.e. the same for all lambs (FBw = 3.4 kg), or an estimated Bw (EBw) based on the first measurement (w) and the interval between birth and the first measurement (D) [(EBw = 2.71009 + 0.208313 w – 0.00578 w (60 – D) + 0.00016 w (60 – D)2]. The average loss of precision associated with the calculation of weights at typical ages was high for P10 (40– 45%), moderate for P30 (6–7%) and low for P70 (2–3%). The loss of precision associated with DwG10/30 was lower than that of the conventional protocol for an interval between birth and the first control between 15 and 45 days (15% maximum), and similar between 7 and 15 days’ intervals (20% maximum). These results suggest simplifying the F2 protocol to two or three measurements and a birth weight. The first measurement should be postponed to 46 days after birth, whereas the inter-val between successive controls may vary between 30 and 40 days, depending on an acceptable loss of precision on the estimation of performances at typical ages.

revue d'élevage et de médecine vétérinaire des pays tropicaux/revue d'élevage et de médecine vétérinaire des pays tropicaux

contrôle de croissance des ovins allaitants en Tunisie. ii. Perte de précision sur le calcul des performances à âge type selon un protocole simplifié alternatif au protocole officiel