Test-day milk yield as a selection criterion for dairy buffaloes (Bubalus bubalis Artiodactyla, Bovidae)

Tonhati, Humberto; Cerón-Muñoz, Mário Fernando; Oliveira, João Ademir de; Faro, Lenira El; Lima, André Luís Ferreira; Albuquerque, Lúcia Galvão de

doi:10.1590/s1415-47572008000400012

Cited by 44 publications

(58 citation statements)

References 11 publications

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“…Similarly, Ramos et al (2006), Tonhati et al (2008) and Rodrigues et al (2010) reported heritabilities of 0.21, 0.19 and 0.25 using REML on the same breed. In contrast, much higher variability (0.39) was reported by Araújo et al (2008) using BI suggesting that there is considerable genetic variability in this breed with a high potential of genetic gain for milk yield through selection.…”

Section: Resultsmentioning

confidence: 79%

Genetic parameters by Bayesian inference for dual purpose Jaffarabadi buffaloes

Malhado

Ramos

et al. 2012

Arch. Anim. Breed.

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Knowledge of genetic parameters is essential for improved reproductive management and increased yield. Quantitative analysis of genetic parameters is lacking for many breeds of buffaloes. This article provides the first estimate of genetic parameters for dual purpose (meat and milk) Brazilian Jaffarabadi buffaloes, using Bayesian inference. Data on milk yield (MY), lactation length (LL), weight at 205 days (W205) and 365 (W365) days of age, and average daily gain (ADG) from 205 to 365 days of age were collected in two herds. Bivariate analyses (using the program MTGSAM) were performed with the Gibbs sampler to obtain estimates of variance and covariance. Average lactation milk yield and lactation length were 1 620.2±450.9 kg and 257.6±46.8 days, respectively, and the mean values for weight traits (kg) were 181.6±63.3 (W205), 298.04±116.1 (W365), and 0.73±0.35 (ADG). Heritability estimates (modes) were 0.16 for MY, 0.10 for LL, 0.43 for W205, 0.48 for W365 and 0.32 for ADG. There was a high genetic correlation (0.96) between milk yield and lactation length and very high genetic correlations (0.99) between the three growth traits. Our data suggest that both milk production and growth traits have clear potential for yield improvement through direct selection in this dual purpose breed. The selection for weight at an early age would be successful and selection for MY can be performed in the first lactation.

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Section: Resultsmentioning

confidence: 79%

Genetic parameters by Bayesian inference for dual purpose Jaffarabadi buffaloes

Malhado

Ramos

et al. 2012

Arch. Anim. Breed.

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“…In 2007, worldwide buffalo and cow milk productions were 85 and 560 million tonnes, respectively (FAO 2009). In the last decades, the Brazilian buffalo milk yield per lactation has significantly increased from 717.3 kg in 1995 (Tonhati et al 1996) to 1 650.0 kg in recent years (Ramos et al 2006, Tonhati et al 2008. This is mainly a consequence of the improvement in management, infrastructure and feeding practices on buffalo farms (Malhado et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Genetic and phenotypic parameters for productive traits in the first three lactations of Khuzestan buffaloes in Iran

2013

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The objective of this study was to estimate genetic parameters for milk and fat yields in Khuzestan buffaloes of Iran. A total of 5 258 production records of the first three lactations of the Khuzestan buffaloes obtained from the Animal Breeding Centre of Iran between 1993 and 2009 were used for the analysis. Genetic parameters were estimated by the multivariate restricted maximum-likelihood (REML) procedure in the Wombat program. The averages of milk and fat production were 2 220.0 kg and 137.6 kg for first lactation; 2 236.8 kg and 137.9 kg for second lactation; and 2 303.6 kg and 143.3 kg for third lactation, respectively. Heritability estimates for milk and fat yields were 0.06 and 0.24 for the first; 0.06 and 0.28 for the second and 0.26 and 0.47 for the third lactation, respectively. Genetic correlation estimates between first and second, first and third, and second and third lactations were 0.77, 0.67 and 0.79 for milk and −0.61, −0.21 and −0.25 for fat yields. These estimates for milk yield are consistent with previous estimates obtained from animal models. Milk production of different lactations is essentially the same trait genetically and combining all lactation records as a single trait is appropriate. On the other hand, negative genetic correlations for fat yield in different lactations indicated that fat yields in all lactations were determined by different genes.

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“…For test-day yields, the heritability estimates ranged from 0.12 to 0.30, with the highest values being observed up to the third test month, followed by a decline until the end of lactation. The present results show that test-day milk yield, mainly during the first six months of lactation, could be adopted as a selection criterion to increase total milk yield (Tonhati et al 2008). Table 3.…”

Section: Modelsmentioning

confidence: 67%

“…Probably, this pattern is due to the fact that only more persistent cows remain producing until the tenth month of lactation which would decrease genetic variability (Tonhati et al 2008). …”

Section: Sire By Herd Interactionmentioning

confidence: 99%