Aly OKAB, Ahmed AL-HAIDARY, Emad SAMARA, Khalid ABDOUN, Mohamed AL BADWI, Mohamed EL-ZAREI, Ali AL-SEAF

Correlation of blood triiodothyronine (T3) level with some production traits in male goat kids

Thyroid hormones are known for their stimulation of feed efficiency and growth performance in different farm animals. Moreinterestingly, the level of thyroid hormones is influenced by selection for growth in some animal species. Therefore, it was the aim ofthe current study to investigate whether a correlation exists between the blood triiodothyronine (T3) level and some production traits(daily feed intake, average daily gain, and feed conversion ratio). To test this hypothesis, six male goat kids (21.9 ± 2.4 kg; 5 monthsold) belonging to Aardi, Damascus, and their cross breed (two kids from each genotype) were used in the current study. The obtainedresults revealed a positive linear correlation of plasma T3 level with both average daily feed intake and average daily gain with correlationcoefficients of 99% and 97%, respectively (P ≤ 0.001). On the other hand, feed conversion ratio was negatively correlated to the plasma T3level with a correlation coefficient of 81% (P = 0.05). The obtained results indicate the possible use of blood T3 level for the prediction offeed intake, daily body weight gain, and feed conversion ratio in addition to the possible use of blood T3 level as a criterion of breedingselection for growth performance in the future.

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