Growth performance and meat characteristics of the first filial Awassi Rambouillet callipyge ram lambs
Aim: This study was designed to introduce the callipyge (CLPG) and 50% of Rambouillet sheep genes to improve meat quality and quantity of Awassi (AW) sheep. Materials and Methods: The CLPG mutation was introduced into the AW sheep through frozen semen of homozygous Rambouillet rams for the CLPG m...
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| Format: | Article |
| Language: | English |
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Veterinary World
2019-06-01
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| Series: | Veterinary World |
| Subjects: | |
| Online Access: | http://www.veterinaryworld.org/Vol.12/June-2019/9.pdf |
| _version_ | 1818655926352084992 |
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| author | Khaleel I. Z. Jawasreh A. H. Al-Amareen P. Y. Aad |
| author_facet | Khaleel I. Z. Jawasreh A. H. Al-Amareen P. Y. Aad |
| author_sort | Khaleel I. Z. Jawasreh |
| collection | DOAJ |
| description | Aim: This study was designed to introduce the callipyge (CLPG) and 50% of Rambouillet sheep genes to improve meat quality and quantity of Awassi (AW) sheep.
Materials and Methods: The CLPG mutation was introduced into the AW sheep through frozen semen of homozygous Rambouillet rams for the CLPG mutation. Four ram lambs from the first-generation Rambouillet callipyge Awassi (F1-RCA) and five from pure AW were recruited for a fattening trial conducted in individual pens using standard ration, following which ram lambs were slaughtered for carcass and meat evaluation.
Results: Final body weight, dry matter intake, average daily gain, and feed conversion ratio were significantly higher in F1-RCA than AW. Hot and cold carcass weights and the other carcass cuts' weights, except for the fat tail, were heavier in F1-RCA than AW. There was no difference in dressing percentage between the two genetic groups (p>0.05). All non-carcass components' weights, except spleen, kidney, and testis, were higher in F1-RCA. Total lean, total bone, and intermuscular fat weight were greater in F1-RCA, but bone-to-lean ratio was lower in F1-RCA when compared with AW (p<0.01). No differences (p>0.05) were observed in all meat quality parameters for muscle longissimus with the exception of pH, redness color, and tenderness that were lower (p<0.05) in F1-RCA than AW. F1-RCA lambs had larger longissimus muscle area (30.9 vs. 16.9 cm2) and less leg fat depth (11.1 vs. 17.4 mm).
Conclusion: The implications of this research show the potential of 50% of Rambouillet genes and the CLPG mutation to improve growth and meat characteristics in AW-Rambouillet crosses and can be used further to develop a meat-type AW with improved productivity and muscle mass. |
| first_indexed | 2024-12-17T03:17:27Z |
| format | Article |
| id | doaj.art-beeb87fc53d347df83e99ec68e5ecfa5 |
| institution | Directory Open Access Journal |
| issn | 0972-8988 2231-0916 |
| language | English |
| last_indexed | 2024-12-17T03:17:27Z |
| publishDate | 2019-06-01 |
| publisher | Veterinary World |
| record_format | Article |
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| spelling | doaj.art-beeb87fc53d347df83e99ec68e5ecfa52022-12-21T22:05:37ZengVeterinary WorldVeterinary World0972-89882231-09162019-06-0112678378810.14202/vetworld.2019.783-788Growth performance and meat characteristics of the first filial Awassi Rambouillet callipyge ram lambsKhaleel I. Z. Jawasreh0A. H. Al-Amareen1P. Y. Aad2Department of Animal Production, Jordan University of Science and Technology, Irbid 22110, Jordan.National Agricultural Research Center, Jordan.Department of Sciences, Faculty of Natural and Applied Sciences, Notre Dame University, Lebanon.Aim: This study was designed to introduce the callipyge (CLPG) and 50% of Rambouillet sheep genes to improve meat quality and quantity of Awassi (AW) sheep. Materials and Methods: The CLPG mutation was introduced into the AW sheep through frozen semen of homozygous Rambouillet rams for the CLPG mutation. Four ram lambs from the first-generation Rambouillet callipyge Awassi (F1-RCA) and five from pure AW were recruited for a fattening trial conducted in individual pens using standard ration, following which ram lambs were slaughtered for carcass and meat evaluation. Results: Final body weight, dry matter intake, average daily gain, and feed conversion ratio were significantly higher in F1-RCA than AW. Hot and cold carcass weights and the other carcass cuts' weights, except for the fat tail, were heavier in F1-RCA than AW. There was no difference in dressing percentage between the two genetic groups (p>0.05). All non-carcass components' weights, except spleen, kidney, and testis, were higher in F1-RCA. Total lean, total bone, and intermuscular fat weight were greater in F1-RCA, but bone-to-lean ratio was lower in F1-RCA when compared with AW (p<0.01). No differences (p>0.05) were observed in all meat quality parameters for muscle longissimus with the exception of pH, redness color, and tenderness that were lower (p<0.05) in F1-RCA than AW. F1-RCA lambs had larger longissimus muscle area (30.9 vs. 16.9 cm2) and less leg fat depth (11.1 vs. 17.4 mm). Conclusion: The implications of this research show the potential of 50% of Rambouillet genes and the CLPG mutation to improve growth and meat characteristics in AW-Rambouillet crosses and can be used further to develop a meat-type AW with improved productivity and muscle mass.http://www.veterinaryworld.org/Vol.12/June-2019/9.pdfAwassi sheepcallipygecarcass compositiongene introgressiongrowth performance |
| spellingShingle | Khaleel I. Z. Jawasreh A. H. Al-Amareen P. Y. Aad Growth performance and meat characteristics of the first filial Awassi Rambouillet callipyge ram lambs Veterinary World Awassi sheep callipyge carcass composition gene introgression growth performance |
| title | Growth performance and meat characteristics of the first filial Awassi Rambouillet callipyge ram lambs |
| title_full | Growth performance and meat characteristics of the first filial Awassi Rambouillet callipyge ram lambs |
| title_fullStr | Growth performance and meat characteristics of the first filial Awassi Rambouillet callipyge ram lambs |
| title_full_unstemmed | Growth performance and meat characteristics of the first filial Awassi Rambouillet callipyge ram lambs |
| title_short | Growth performance and meat characteristics of the first filial Awassi Rambouillet callipyge ram lambs |
| title_sort | growth performance and meat characteristics of the first filial awassi rambouillet callipyge ram lambs |
| topic | Awassi sheep callipyge carcass composition gene introgression growth performance |
| url | http://www.veterinaryworld.org/Vol.12/June-2019/9.pdf |
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