Yield and Milk Composition at Different Stages of Lactation from a Small Herd of Nguni, Boer, and Non-Descript Goats Raised in an Extensive Production System

Abstract

This study was conducted to evaluate the yield and composition of milk from 30 indigenous South African goats of different genotypes, namely Nguni, Boer, and non-descript, reared under a free-ranging system. Milk yield and composition (milk fat, protein, lactose, solid non-fat, and minerals) from Nguni (10), Boer (10) and non-descript (10) goats were measured and analysed per week at each stage of lactation. Results showed that Nguni goats produced (1.2 ± 0.09, 1.3 ± 0.11 and 1.2 ± 0.07 L per day) more milk (p < 0.05) at early, mid-, and late stages of lactation than Boer (0.6 ± 0.10, 1.0 ± 0.17, and 0.6 ± 0.09 L per day) and non-descript (0.3 ± 0.10, 0.3 ± 0.12, and 0.3 ± 0.09 L per day) goats, respectively. The mean value of milk fat, protein, and lactose content from Nguni goats was 3.98, 3.54, and 5.31; Boer goats, 2.9, 3.59, and 5.04 and non-descript goats, 4.05, 3.39, and 5.02, respectively. There was a significant effect (p < 0.05) of genotypes on milk fat, milk magnesium, and sodium contents of Nguni, Boer, and non-descript goats. It could be concluded that Nguni goats produced more milk than Boer and non-descript goats, but the non-descript goat had a higher mean percentage of milk fat compared to Nguni and Boer goats.

Milk Yield and Composition of Mixed-Breed Goats on Rangeland during the Dry Season and the Effect on the Growth of Their Progeny

“…This is contrary to our finding where medium milk yield did not depress milk components in mixed-breed goats. Our results, however, are in line with the results of Idamokoro et al [ 33 ] who found no correlation between milk yield and milk compositions for non-descript grazing goats.…”

Evaluation of Milk Yield and Milk Composition of Honamlı Goats

“…On the other hand, there were some reports related to variations of fat content (Pridalová et al, 2008;Strzałkowska et al, 2010;Králíčková et al, 2013;Klir et al, 2015). When the results of this study were compared with previous studies, it can be said that they were lower than the values reported by some researchers (Klir et al, 2015;Kučević et al, 2016;Idamokoro et al, 2017). Fat composition of Honamlı goat milk may be associated with feeding regime, because it's a fact that fat and protein content of milk is influenced mostly by feeding (Toledo-Alonzo, 2003;Goetsch et al, 2011).…”

“…While this value was compatible with the other studies (Sengonca et al;2003;Ata, 2007) related to native goats breeds of Turkey; Simsek et al ( 2006) found higher values(0.900 kg.) than the present study.Additionally, there were variability of daily milk yield reports for different goat breeds for numerous authors (Mestawet et al, 2012;Králíčková et al, 2013;El-Tarabany et al 2016;Idamokoro et al, 2017). The milk yield value of Honamlı goat might be associated with genotype and especially inadequacy of nutritional imbalance because of extensive rearing system.…”

The whole issue

“…While this value was compatible with the other studies (Sengonca et al;Ata, 2007) related to native goats breeds of Turkey; Simsek et al ( 2006) found higher values(0.900 kg.) than the present study.Additionally, there were variability of daily milk yield reports for different goat breeds for numerous authors (Mestawet et al, 2012;Králíčková et al, 2013;El-Tarabany et al 2016;Idamokoro et al, 2017). The milk yield value of Honamlı goat might be associated with genotype and especially inadequacy of nutritional imbalance because of extensive rearing system.…”