Summary
Genetic groups, year and season of shearing, sex and ewe's weight at lambing accounted for a significant proportion of variation in first and second 6-monthly greasy fleece weights of Rambouillet crosses with Chokla, Malpura and Jaisalmeri (F1, F2, 5/8, 3/4 and 3/4 interbreds), except that season did not influence significantly the second 6-monthly greasy fleece weight. Sex was not included in the analysis of the second fleece weight.
Comparisons among genetic group means showed that:
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(i)
Chokla crosses were superior to the other crosses;
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(ii)
there was a small and non-significant decline in both the greasy fleece weights with an increase in level of Rambouillet inheritance;
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(iii)
interbreeding halfbreds and 3/4 breds resulted in a small and non-significant decline in fleece weight, except in Rambouillet × Chokla crosses for the second 6-monthly clip, where the decline was significant.
The results indicate that crossing Indian carpet wool breeds with Rambouillet will improve greasy fleece production. Exotic fine wool inheritance should be stabilised at 50% and further improvement be brought through selection among the halfbreds.
Résumé
Les groupes raciaux, l'année et la saison de tonte, le sexe et le poids des brebis à l'agnelage ont été responsables pour une proportion significative de variations de poids des premières et secondes tontes pratiquées à six mois d'intervalle chez des croisements Rambouillet (Chokla, Malpura et Jaisalmeri (croisement F1, F2, 5/8, 3/4 et 3/4), cependant, la saison n'a pas eu d'influence significative sur le poids de la toison lors de la seconde tonte. L'influence du sexe n'a pas été prise en compte dans l'analyse du poids de la seconde tonte.
Des comparaisons de moyennes observées sur des groupes raciaux ont montré que: 1) les croisements Rambouillet ¢ Chokla étaient supérieurs aux autres croisements, 2) il y avait une diminution légère et non significative du poids des deux tontes liée à l'augmentation de sang de Rambouillet et 3) le croisement entre demi-sang et 3/4 sang engendrait une diminution légère mais non significative du poids de la toison, exception faite du croisement Rambouillet × Chokla lors de la seconde tonte où la diminution est significative. Les résultats obtenus indiquent que le croisement du mouton indien, utilisé pour la laine à tapis, avec le Rambouillet est de nature à augmenter la production de laine à suint. L'héritage génétique responsable de la belle qualité de laine exotique devrait étre stabilisé à 50 p. 100 et toute amélioration à venir doit se faite par sélection parmi les demi-sang.
Resumen
Los grupos genéticos, el año y la estación de esquileo, el sexo y peso de las ovejas, contribuyeron en proporción significativa a las variaciones en peso del vellón grasoso en la primera y segunda esquila efectuadas con 6 meses de intervalo, de cruces de Rambouillet con Chokla, Malpura y Jaisalmeri (F1, F2, 5/8, 3/4, y 3/4 entrecruzados), excepto que la estación no influyó significativamente el peso del vellón grasoso en la segunda esquila. El sexo no se incluyó eu el análisis del peso del segundo vellón.
La comparación de las medias entre grupos genéticos mostró lo siguiente: 1) Los cruces de Chokla fueron superiores 2) Hubo una baja insigificante en el peso vellón grasoso con el incremento de sangre Rambouillet 3) El apareamiento de animales media sangre y 3/4 dió como resultado una baja insignificante en el peso del vellón grasoso, excepto en cruces de Rambouillet × Chokla en los cuales el peso del vellón grasoso fué significativamente menor en la segunda esquila. Los resultados indicaron tambien, que el cruce de razas Indian carpet wool con Rambouillet incrementó la producción de lana. La herencia de lana fina exótica debe establecer en un 50% y el mejoramiento posterior debe hacerse a través de la selección de animales media sangre.
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Malik, R.C., Singh, R.N. & Acharya, R.M. Breeding for improving wool production. Trop Anim Health Prod 12, 177–183 (1980). https://doi.org/10.1007/BF02242650
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DOI: https://doi.org/10.1007/BF02242650