Abstract
The aim of this study was to identify the average of productive and reproductive traits in Red Sindhi females and evaluate if there is an influence of the reproductive traits on milk yield in this breed. Data related to reproductive and productive traits of 638 Sindhi breed dairy cows from North, Northeast, Midwest and Southeast regions of Brazil were provided by ABCZ. Analysis of variance followed by analysis of correlation among reproductive traits and between these and milk yield traits were used. Averages for age at first calving (AFC), calving age (CA), calving interval (CI), reproductive efficiency (RE), dry period (DP), lactation period (LP),milk yield (MY), and total milk yield (TMY) were 549.83 ± 560.47 days; 1843.53 ± 739.99 days; 533.28 ± 206.66 days; 75.46 ± 19.95%; 248.28 ± 206.66 days; 263.22 ± 63.51 days; 7.08 ± 2.78 kg of milk. day-1 and 1875.28 ± 893.36 kg of milk.lactation-1, respectively. The traits AFC, calving order (CO), CA, CI, RE and LP were separated into categories and there was no effect on MY among different categories, while the CO showed positive correlation with LP. Therefore, it can be concluded that Red Sindhi breed dairy cows showed high averages for AFC and medium averages for MY, CI and RE.
Highlights
Red Sindhi Zebu breed (Bos indicus) has been standing out among other breeds to show median size, heat and ectoparasites resistance, sexual precocity, elevated conception, longevity, feed efficiency and good averages for milk and carcass yield
Red Sindhi breed reproductive and productive performance data were collected from Zebu Breeders Association (ABCZ) database, including females belonging to 28 herds located in the states of Paraiba, Rio Grande do Norte, Minas Gerais, Ceara, Distrito Federal, São Paulo, Espirito Santo and Para
From 777 calvings observed during the period of this study, 152 corresponded to calving orders from first to ninth order, and it were dismissed due to lack of information
Summary
Red Sindhi Zebu breed (Bos indicus) has been standing out among other breeds to show median size, heat and ectoparasites resistance, sexual precocity, elevated conception, longevity, feed efficiency and good averages for milk and carcass yield. The majority of the Zebu in Brazil are applied primarily for meat or secondarily for milk In this sense, the introduction of Sindhi breed can accentuate the importance of Brazil as a major center of Zebu selection for genetic improvements programs (Santiago, 2009; Santos, 2011; Associação Brasileira de Criadores de Zebu, 2014; Silva et al, 2014; Panetto et al, 2017; Carvalho et al, 2018). Red Sindhi breed exhibits hardiness and adaptability to the adverse climatic conditions, showing, during the dry periods of the year, good body condition score and the ability to convert low quality food in meat and milk. In addition to the hardiness and adaptability to the Northeast region, Sindhi breed shows good averages for milk yield traits (Moura et al, 2009; Cardoso et al, 2015; Mello et al, 2016)
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