Age -Dependent Effect of Foal Heat Breeding on Pregnancy and Embryo Mortality Rates in Thoroughbred Mares

被引：6
|
作者：
Malheiros de Souza, Joao Ricardo [1 ]
Dias Goncalves, Paulo Bayard [1 ,2 ]
Bertolin, Kalyne [1 ]
Ferreira, Rogerio [3 ]
Sardinha Ribeiro, Ana Silvia [4 ]
Ribeiro, Djacy Barbosa [5 ]
da Encarnacao Fiala Rechsteiner, Sandra Mara [6 ]
de Araujo, Reno Roldi [7 ,8 ]
Pimentel, Claudio Alves [9 ]
Hammes Pimentel, Anelise Maria [10 ]
机构：
[1] Univ Fed Santa Maria UFSM, Lab Biotecnol & Reprod Anim BioRep, Santa Maria, RS, Brazil
[2] Univ Fed Pampa Unipampa, Lab Fisiol Mol & Integrat Reprod MINT, Uruguaiana, RS, Brazil
[3] Univ Estado Santa Catarina, Dept Zootecnia, Chapeco, SC, Brazil
[4] Univ Fed Rural Amazonia UFRA, Inst Socio Ambiental & Recursos Hidr, Belem, Para, Brazil
[5] Univ Fed Rural Amazonia UFRA Belem, Inst Saude & Prod Anim, Belem, Para, Brazil
[6] Univ Fed Pelotas UFPEL, Inst Biol, Historep, Campus Saude, Pelotas, RS, Brazil
[7] Brasil Reprod Anim, Iguacu, RJ, Brazil
[8] Univ Iguacu UNIG, Iguacu, RJ, Brazil
[9] Univ Fed Pelotas UFPEL, Fac Med Vet, Dept Patol Anim, Capao Do Leao, RS, Brazil
[10] Univ Fed Pelotas UFPEL, Fac Agron Eliseu Maciel, Dept Zootecnia, Campus Capao do Leao, Capao Do Leao, RS, Brazil
来源：
JOURNAL OF EQUINE VETERINARY SCIENCE | 2020年 / 90卷
关键词：
REPRODUCTIVE EFFICIENCY; SUBFERTILE MARES; POSTPARTUM; FERTILITY; YOUNG; INVOLUTION; STALLIONS; OOCYTES; DAY-2; STUD;
D O I：
10.1016/j.jevs.2020.102982
中图分类号：
S85 [动物医学（兽医学）];
学科分类号：
0906 ;
摘要：
The aim of the present study was to evaluate the correlation of age and heat cycle to determine reproductive efficiency in young and aged Thoroughbred mares bred on foal heat (FH) or on second heat (SH) after foaling. Embryo mortality (EmbM) was determined every time a mare was found open after a positive pregnancy diagnosis. Parturition to breeding interval, pregnancy rate (PregR) and EmbM rate were the dependent variables and the treatments were breeding on the FH or on SH. The cutoff age to obtain above-average probability for the EmbM was 10 years old. PregR in mares bred on FH was lower compared with SH (P < .01); however, it was neither affected by the age of mares (P > .05) nor by the age group of mares (P > .05). Regarding FH and SH, there was a difference in PregR in young mares (P < .01), unlike in aged mares (P > .05). EmbM rate was not different between mares bred on FH or SH (P > .05) although it was affected by age of mares (P < .01). EmbM was higher in oldest than young mares (P < .01). Aged mares bred on FH had a significantly higher EmbM rate compared with the young group also bred on FH (P < .01). In conclusion, the reproductive efficiency of Thoroughbred mares bred on FH is dependent of the age. Aged mares (≥10 years old) should be bred at their SH to reduce EmbM and improve reproductive performance. © 2020 Elsevier Inc.
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页数：6
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