Animal Science Journal最新文献

This study aimed to evaluate the effects of a fermented total mixed ration (TMR) on feed intake, digestibility, rumen fermentation, and milk production in dairy cows in a hot environment. The experiment was conducted twice, with four multiparous Holstein cows used in each trial. Fresh and fermented TMR were used as dietary treatments in a crossover experimental design. Fresh and fermented TMR had the same diet composition. Fresh TMR was prepared every morning. Fermented TMR was prepared by baling fresh TMR and sealing it with a bale wrapper, followed by storage outdoors. Dry matter intake and digestibility did not differ between groups. Cows fed fermented TMR showed increased intake and digestibility of crude protein and non-fiber carbohydrate. Rumen total volatile fatty acids and propionate concentration were higher in cows fed fermented TMR than in those fed fresh TMR. Milk yield tended to increase in the cows fed fermented TMR. These results indicated that feeding fermented TMR to dairy cows in a hot environment altered feed digestibility and rumen fermentation and increased milk production. Therefore, fermented TMR is a suitable feed for lactating cows in a hot environment and is an effective technology for heat management.

The aim of this study was to evaluate the effect of different protein sources on the fattening performance and carcass characteristics of finishing bulls. Thirty HF bulls in three feeding groups were fed diets with different protein sources: rapeseed meal (RSM), Vicia faba seeds (VFB), and lupine seeds (LP). The proportions (g/kg DM) of feed ingredients in the diets were as follows: group RSM-MS (maize silage) 620, TG (Triticale grain) 210, and RSM 150; group VFB-MS 620, TG 170, and VFB 190; group LP-MS 620, TG 190, and LP 170. Bulls fed RSM were characterized by the highest ADG and feed intake, and the most desirable FCR (p < 0.05). Carcass conformation and fatness scores were higher in group RSM than in groups VFB and LP. Tannins contained in V. faba seeds did not exert a positive influence on feed intake, average daily gain (ADG) or the feed conversion ratio (FCR). The value of WBSF was lowest in group VFB, indicating superior meat tenderness (p < 0.05). The inclusion of feed component containing tannins resulted in lower (p < 0.05) redness and higher pH stability of their meat during storage.

The structure of coat hairs in golden takin (Budorcas taxicolor bedfordi) classified into the Bovidae family, living in harsher environmental conditions, is compared with the cattle's coat hair data. Morphological study and structural analysis with WAXD (wideangle X-ray diffraction) measurements were made on the hair samples, and the structural features were investigated. The overcoat hair in takin contained a continuous thick medullated tissue in its center while the undercoat hair was crimped finely and has no medullated tissue. Those morphologies of coat hairs will be effective to keep a vital temperature in harsh winter. The observation of the longitudinal section of the overcoat hair revealed the continuous dendritic framework-structured medullated tissue with air spaces and/or, in some cases, filling the spaces with wax-like granules. In the WAXD measurements of the summer coat hairs, similar α-keratin WAXD peaks were recorded except for the weak arc-shaped scattering peaks at around 2θ = 20.6°, 22.4°, which coincided with the peaks of the β′ crystal form of the fats.

Early prediction of carcass traits, particularly carcass weight and beef marbling score, is critical for optimizing beef production efficiency. We explored prediction models for these carcass traits using plasma free amino acid and related metabolite profiles during the midfattening period (20 months) in female Japanese Black cattle (n = 52). Stepwise multiple regression analysis and leave-one-out cross-validation were used to construct and evaluate the model. However, analyses that included all cattle were unsatisfactory, likely due to data variability and/or insufficient sample size. When cattle were categorized into two fattening durations, conventional (n = 28) and longer term (n = 24), prediction models for both carcass traits were successfully developed and validated, suggesting that differences in the fattening duration influenced the quality of the prediction models. From a total of 24 amino acids and six related metabolites, five to nine amino acids were selected as key predictors, emphasizing the dominant role of amino acids in this study. These findings suggested that plasma free amino acid profiles are potential practical predictors of carcass traits in beef production. Future studies with larger, regionally diverse datasets and varying fattening durations are essential to enable broader industrial applications.

Kyrgyzstan lies at the merge point of two ancient trade routes (the Eurasian Steppe and the Oasis Routes) and represents a key geographic region associated with probable goat propagation. Our study aimed to clarify goat propagation and the relationship between human activity and goats in Asia by investigating the genetic structure of Kyrgyzstan goats. We analyzed the mtDNA hypervariable region 1, the SRY 3′UTR, and genome-wide SNPs of 30 Kyrgyzstan goats. The mtDNA sequences were classified into three haplogroups: A (n = 25/30), D (n = 3/30), and G (n = 2/30), similar to that observed in Central Asia. Haplogroup G, mainly reported in the Middle East but absent in Central Asia, suggested a propagation route into Kyrgyzstan along the Oasis Route. For SRY haplotypes, Y1AB (n = 3/18) and Y2A (n = 15/18) were identified. The haplotype Y2A, largely distributed in Central Asia, implied genetic influence on Kyrgyzstan goats from the Eurasian Steppe Route. Genome-wide SNPs revealed that the Kyrgyzstan population formed a geographic cline extending from Russia to East Asia. Our findings reflect combined influences of the Eurasian Steppe and Oasis Routes on the genetic structure of Kyrgyzstan goats and illuminate their migration process through these routes.

This study evaluated the effects of substituting palm kernel cake (PKC) with spent coffee grounds (SCG) in goat concentrate diets on growth performance, feed utilization, and rumen fermentation. Sixteen male crossbred goats (15.7 ± 1.02 kg body weight) were randomly allocated to four dietary treatments in a completely randomized design: 0%, 25%, 50%, and 75% replacement of PKC with SCG. The substitution significantly influenced body weight gain (BWG), average daily gain (ADG), and feed intake (p < 0.05). Goats fed 0% and 25% SCG showed the highest BWG and ADG, whereas the 75% group exhibited the lowest (p < 0.05). Apparent digestibility of organic matter, crude protein, and acid detergent fiber peaked at 25% and 50% replacement levels (p < 0.05). Total volatile fatty acid concentrations declined with increasing SCG inclusion, showing a cubic response (p < 0.05). These findings indicate that incorporating SCG at up to 50% of the concentrate can enhance digestibility and fermentation without compromising growth. Nonetheless, a 25% replacement level yielded the most favorable economic performance. This study supports the potential of SCG as a cost-effective alternative feed ingredient to promote sustainable goat production.

The understanding and use of plant resources, coupled with the strategic selection of forage species, play crucial roles in biodiversity preservation, enhanced biomass production, nutrient supply, and a reduced ecological footprint. This study aimed to characterize the forage potential of perennial plant species in high Andean ecosystems. Species naturally occurring in livestock production systems were identified and classified based on their botanical and agronomic characteristics. We assessed biomass production, bromatological composition, carbon sequestration, in vitro dry matter digestibility, and methane emissions. Among the 28 identified species, 17 presented optimal characteristics: high biomass, protein (> 7%), gross energy (> 3500 kcal kg⁻¹), neutral detergent fiber (NDF), acid detergent fiber (ADF) percentages (< 42% and < 37%, respectively), and in vitro digestibility (> 40%). Plants with relatively high secondary metabolite contents exhibited reduced methane emissions. Carbon uptake varied from 3.27 to 35.41 g C m⁻² or plant. The recognized forage potential of these perennial plant species offers a sustainable option for integration into ruminant feeding systems and silvopastoral practices in the tropical Andes. This strategic integration presents a viable approach for mitigating the impacts of livestock farming in response to climate change.