Effects of genotype, parity, season and their interactions on milk yield in crossbred dairy cattle

Abstract

The crossbred dairy cattle (CDC) have been gaining popularity in the tropical countries for their increased milk yield within a short period of time because of heterogenic additive gene action. Hence, we aimed to investigate whether genotype, parity, season and their interactions had any effect on average daily milk yield (ADMY) of the CDC in a dairy farm at Chattogram district, Bangladesh, for a period of 3 years from January 2016 to December 2019. Total 16,425 retrospective lactation records of 150 multiparous Sahiwal × Friesian1 (Sahiwal = 50%, HF = 50%), Local × Friesian1 (Local = 50%, HF = 50%) and Local × Friesian2 (Local = 25%, HF = 75%) CDC from the first to the third parities (50 for each parity) were collected from the farm records. The generalized linear model and principal component analysis identified substantial impacts of genotype, parity, season and their interactions on ADMY of the CDC. The herd level least squared ADMY was 11.22 ± 0.04 kg/days on a 305‐days typical lactation period. The Sahiwal × Friesian1 CDC produced 7.2% and 5.5% more milk than the Local × Friesian1 and Local × Friesian2 respectively. The CDC produced maximum milk in the second parity, which was 7.8% and 0.34% more than the first and third parities. Similarly, the highest ADMY was recorded in the spring, which was 10.8%, 7.3% and 6.6% more than the fall, summer and winter respectively. It was concluded that the Sahiwal × Friesian1 crossbred produced maximum milk in the spring season at the second parity while other determinants remained constant. The changing patterns of milk yield in different genotype, parity and seasons provided scientific evidence for improving feeding strategy to optimize herd level milk yield of CDC in the commercial dairy farms under tropical perspective.

Recent advances in decision support for beef and dairy farming: modeling approaches and opportunities

“…Other studies focusing on biological yield and/or financial performance include Barua et al. (2022), Gargiulo et al. (2022), Hyde et al.…”

“…Of those 10 articles, 8 also focus on biological yield or financial performance (Cha et al, 2016;Sayers, 2017;Telldahl et al, 2019;Dahl et al, 2020;Ekine-Dzivenu et al, 2020;Põldaru and Luik-Lindsaar, 2020;Bobbo et al, 2021;Islam et al, 2021). Other studies focusing on biological yield and/or financial performance include Barua et al (2022), Gargiulo et al (2022), Hyde et al (2021), Hansen et al (2021), andAliloo et al (2017). Three of the 25 studies consider environmental performance, namely Alqaisi and Schlecht (2021), Flaten et al (2019b), andBasnet et al (2018).…”