TY - JOUR
T1 - Growth and reproductive performance in females of Romosinuano cattle
AU - Martínez-Rocha, Ricardo
AU - Ramírez-Valverde, Rodolfo
AU - Núñez-Domínguez, Rafael
AU - García-Muñiz, José G.
AU - Parra-Bracamonte, Gaspar M.
N1 - Publisher Copyright:
© 2020 Journal MVZ Cordoba 2020. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by-nc-sa/4.0/), lets others remix, tweak, and build upon your work non-commercially, as long as they credit you and license their new creations under the identical terms. All Rights Reserved.
PY - 2020/4/1
Y1 - 2020/4/1
N2 - Objective. To characterize growth curves and reproductive performance of Romosinuano cows in Mexico. Materials and methods. Weight and age records (928) of females (117) for growth traits and calving records (459) of cows (113) for reproductive traits were analyzed. Four non-linear mixed models were adjusted to describe the growth curves. Indicators of age at 50% of maturity (A50M), and percentage of maturity at 18 months of age (PM18) were estimated. The reproductive performance was evaluated through the age at first calving (AFC), the calving interval (CI), and calving rate (CR). Results. The Brody model showed the best adjustment to the growth curve. The A parameter, which estimates maturity weight, fluctuated within 430.2 and 466.2 kg; the b parameter within 0.94 and 5.45; and the k parameter within 0.001 and 0.002; depending on the used model. The A50M varied from 20 to 21 months, and the PM18 from 44.5 to 45.5%. The means for AFC, CI, and CR at 550 d were 1059±282 d, 553±68 d, and 74±19%; those indicators improved (p<0.05) when cows have a higher percentage of their maturity weight, depending on calving season. Conclusions. The estimates of maturity weight indicate that Romosinuano cattle could be considered as a breed of small or medium size, with an acceptable reproductive ability. The females with small estimated maturity size aged at first calving earlier than cows with high weights.
AB - Objective. To characterize growth curves and reproductive performance of Romosinuano cows in Mexico. Materials and methods. Weight and age records (928) of females (117) for growth traits and calving records (459) of cows (113) for reproductive traits were analyzed. Four non-linear mixed models were adjusted to describe the growth curves. Indicators of age at 50% of maturity (A50M), and percentage of maturity at 18 months of age (PM18) were estimated. The reproductive performance was evaluated through the age at first calving (AFC), the calving interval (CI), and calving rate (CR). Results. The Brody model showed the best adjustment to the growth curve. The A parameter, which estimates maturity weight, fluctuated within 430.2 and 466.2 kg; the b parameter within 0.94 and 5.45; and the k parameter within 0.001 and 0.002; depending on the used model. The A50M varied from 20 to 21 months, and the PM18 from 44.5 to 45.5%. The means for AFC, CI, and CR at 550 d were 1059±282 d, 553±68 d, and 74±19%; those indicators improved (p<0.05) when cows have a higher percentage of their maturity weight, depending on calving season. Conclusions. The estimates of maturity weight indicate that Romosinuano cattle could be considered as a breed of small or medium size, with an acceptable reproductive ability. The females with small estimated maturity size aged at first calving earlier than cows with high weights.
KW - Age at first calving
KW - calving interval
KW - genetic resources
KW - growth models
KW - liveweight
UR - http://www.scopus.com/inward/record.url?scp=85098205700&partnerID=8YFLogxK
U2 - 10.21897/RMVZ.2033
DO - 10.21897/RMVZ.2033
M3 - Artículo
AN - SCOPUS:85098205700
SN - 0122-0268
VL - 26
SP - 1
EP - 9
JO - Revista MVZ Cordoba
JF - Revista MVZ Cordoba
IS - 1
ER -