A Trace Mineral Injection before Joining and Lambing Increases Marking Percentages and Lamb Weights on Diverse Farms in Victoria, Australia

Abstract

This study was conducted on five commercial farms across Victoria, Australia, between September 2018 and November 2019, where the TM status of ewes was within normal ranges before joining. Mix breed ewes (n = 1484) were randomly allocated to receive either nil treatment (Control) or two injections of an ITM product containing zinc (40 mg/mL), manganese (10 mg/mL), selenium (3 mg/mL), and copper (10 mg/mL); 0.2 mL per 10 kg BW (Multimin® plus Copper for Sheep, Virbac (Australia) Pty Ltd., Milperra, NSW, Australia) 30 days before the start of joining and 30 days before the start of lambing. Approximately 90 days after joining, pregnancy status and conception rate were determined by ultrasound. The marking rate was determined approximately four weeks after the end of lambing, and lamb weights were determined at weaning (12 weeks after the end of lambing). In all farms, ITM treatment did not affect the conception rate. The average conception rate was 156 ± 11.0% (p > 0.05). The marking rate of ITM ewes was 9% higher than control ewes (95% Confidence Interval 3–21%). Lambs born to ITM ewes were 2.31 kg heavier at weaning than lambs born to control ewes (p < 0.001). Although not significant, ewe mortality across farms was 1.3% lower in the ITM group than in the control group. On average, ewes treated with ITM pre-joining and pre-lambing produced more and heavier lambs that represent an extra AU$ 2338 per 100 ewes net benefit for the producer. These results help to understand strategic TM supplementation for animal health, performance and farm profitability beyond the treatment of clinical deficiencies.

Nutrición animal: Texto de formación universitaria

“…La deficiencia combinada de selenio y vitamina E en cuyes se manifiesta con miopatía fatal, asociada con la peroxidación de lípidos en el músculo afectado (Hill et al, 2001); en terneros, corderos y cabritos, por la enfermedad del músculo blanco; en potros y burros, se asocia con incidencia de la enfermedad del músculo blanco y enfermedad de la grasa amarilla; en cerdos, el síndrome de deficiencia de vitamina E/selenio (Hosnedlova et al, 2017); en pollos parrilleros, atrofia pancreática nutricional y trastorno metabólico de la glucosa y los lípidos ; en corderos, la deficiencia de selenio induce cambios notables en las cantidades circulantes de hormonas tiroideas en los corderos, lo que puede estar asociado con trastornos posnatales, como nacidos muertos y muertes neonatales (Gonzalez-Rivas et al, 2023); y en humanos, la enfermedad de Keshan, una miocardiopatía endémica primaria que solo ocurre en áreas con bajo contenido de selenio desde el noreste hasta el suroeste de China continental .…”