Genetic Evaluation of Holsteins in Columbia

Abstract

Original data consisted of 31,777 records of progeny of 1442 sires for calvings between 1975 and 1983. Unadjusted means for milk yield (kg), days in milk, days dry, calving interval, days carried calf, and age at calving were 4281, 267, 88, 421, 145, and 36.6. Estimated total variance for first lactation milk yield by Henderson's method 3 was 1,385,436 kg 2 with sire and error variances accounting for 1.8 and 98.2%. Heritabilities for milk yield, lactation length, age at calving, and days carried calf were .07, .06, 2.59, and .01. High estimate for age was attributed to confounding of sires with season of calving. Genetic and phenotypic correlations between traits were milk and lactation length, .76 and .72; milk and age at calving, .17 and -.04; milk and days carried calf, -2.11 and .13; lactation length and age at calving, -.13 and -.06; lactation length and days carried calf, .87 and 16.; age at calving and days carried calf, -.60 and -.03. Sires with at least 10 daughters were evaluated by best linear unbiased prediction procedures. First lactation sire values for milk ranged from 359 to -340 kg with an average difference between sires of 12 kg. Sire values using all lactations ranged from 505 to -286 kg with an average difference between sires of 13 kg. Rank correlation between all and first lactation evaluations was .77.

Estimation of Genetic and Non-Genetic Parameters of Friesian Cattle under Hot Climate

“…AFC was negatively correlated with GP and positively with S/C, this findings is similar to the results of Moore et al (1990) and Abubakar et al (1986) who reported a negative phenotypic correlation between AFC and GP and between AFC and TMY. Whereas Barrada et al (1969) and El Barbary et al (1983) reported positive phenotypic correlation between AFC and TMY.…”

“…Positive correlation with LL was also reported by Mohiuddin et al (1992), positive correlation with S/C was agreed with Vij and Tiwana (1986) who were also reported negative phenotypic correlation with GP and TMY. LL was negatively correlated with GP; this was disagreed with the findings of Abubakar et al (1986).…”

Genotype × Environment Interaction for Age at First Calving in Brazilian and Colombian Holsteins

“…However, for AFC, Seykora and McDaniel (1983) stated that selection for milk yield resulted in a favorable reduction in AFC in heifers, in agreement with the reports by McDaniel and El-Sayed (1980), and Hansen et al (1983a, 1983b. Abubakar et al (1986) and Pearson de Vaccaro (1974) reported that Holstein cattle were older at first calving in South America than in other countries, and suggested nutritional differences as a main cause.…”

Effect of Calving Season, Calving Year and Lactation Number on the Milk Yield Traits in Holstein Cows Raising in Şanlıurfa

“…The LL was calculated as 314.3 days in this study. While this value was higher than the value reported by some researchers (Abubakar et al, 1986;Catillo et al, 1995;Sehar ve Özbeyaz, 2005;Özçelik ve Arpacık, 2000), it was lower than that reproted by some other researchers (Akkaş, 2008;Çerçi, 2006;Haile-Mariam et al, 2003;Koçak et al, 2007;Parlak ve Kandır, 2015;Ojango and Pollot, 2002) and was similar to that calculated by some others (Bayrıl and Yılmaz, 2017;Doğan M, Kaygısız, 1999). This value appears to be about 9 days longer than the 305 day period, which is considered as the standard lactation time.…”