Reproductive performance of backcross Holstein × Brown Swiss and their Holstein contemporaries under subtropical environmental conditions

The objective of this study was to evaluate the effect of different hormonal protocols on the reproductive performance of Santa Inês ewes in Amazon environmental conditions. Twenty-two Santa Inês ewes between 3 and 4 years-old were distributed in a randomized block experimental design, where the treatments consisted of two protocols for estrus synchronization (short and long) with eleven animals each. Data on the occurrence of estrus were described for each protocol. Data of estrus, pregnancy, and prolificity were firstly subjected to ANOVA and a subsequent Tukey’s test. Results were considered significant at p ≤ 0.05. The short-term protocol presented an interesting successful rate, where above 70% ewes tested had estrus. The long-term protocol also achieved a high successful rate, where above 80% ewes tested had estrus. However, comparing the protocols, the long-term protocol presented better results of positive estrus and pregnancy rates in ewes. Thus, it can be concluded that both protocols presented satisfactory results regarding estrus manifestation, and prolificity (lambs produced per ewe). However, under Amazon environmental conditions, the long-term protocol presented better results regarding positive manifestation of estrus and pregnancy rate.

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REPRODUCTIVE PERFORMANCE OF BROWN SWISS AND MESTIZO BOVINE IN HUMID TROPIC

SPERMOVA ◽

10.18548/aspe/0009.08 ◽

2021 ◽

Vol 11 (1) ◽

pp. 53-59

Author(s):

Ramon Troncoso ◽

◽

C Medina ◽

Juan Reategui

Keyword(s):

Heat Stress ◽

Reproductive Performance ◽

Climatic Conditions ◽

Humid Tropic ◽

Brown Swiss ◽

Parametric Statistics ◽

Spss Software ◽

Regulate Body Temperature ◽

Student’S T ◽

Student’S T Test

The ability of ruminants to regulate body temperature depends on the genotype. Dairy breeds are generally more sensitive to heat stress than beef breeds. Higher-producing animals are more susceptible to heat stress because they generate more metabolic heat. The objective of evaluating reproductive performance as a response of adaptability to the management and climatic conditions of the Humid Tropics. 78 animals were used (40 Brown Swiss, from Puno and 38 Mestizas from local origin) raised in humid tropic conditions. Parametric statistics are presented as analysis of measures of central tendency and dispersion, non-parametric statistics by frequency analysis, the χ2 test of independence was used to detect differences, α = 0.05. The categorized and continuous dependent variables were evaluated with Student's t test using SPSS Software v.23. The mean age at first estrus in Brown Swiss was 12.43 months, in mestizo cattle 18.68 months (P <0.05). Average age of first calving in Brown Swiss of 25.25 months versus mestizo cattle 28.34 months (P <0.05). Interval from calving to the first service in Brown Swiss was 99.29 days. Open days observed in Brown Swiss was 107.29 days. The pregnancy rate at the first service in Brown Swiss was 70.0% pregnancy at the first service and 30.0% at the second service, for the mestizo genotype it was 68.4% at the first service, 28.9 at the second and 2.6 at the third service (P> 0.05; X2 = 0.50; p = 0.47). It is concluded that bovine animals of the Brown Swiss genotype have a good reproductive performance in the Humid Tropic climate compared to the Mestizo genotype

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Effects of calving difficulty on the subsequent reproductive performance and milk production of Holstein, Brown Swiss and their crosses

Livestock Science ◽

10.1016/j.livsci.2015.08.004 ◽

2015 ◽

Vol 180 ◽

pp. 263-267 ◽

Cited By ~ 1

Author(s):

Mahmoud S. El-Tarabany

Keyword(s):

Milk Production ◽

Reproductive Performance ◽

Brown Swiss ◽

Calving Difficulty

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