Changes in milk production and milk fatty acid composition of cows switched from pasture to a total mixed ration diet and back to pasture

Rego, Oldemiro Aguiar do; Cabrita, Ana R.J.; Rosa, H.J.D.; Alves, Susana P.; Duarte, V Jesús; Fonseca, António J.M.; Vouzela, Carlos Fernando Mimoso; Pires, Fernando Rocha; Bessa, Rui J.B.

doi:10.1080/1828051x.2016.1141330

Cited by 40 publications

(29 citation statements)

References 24 publications

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“…For instance, the content of vaccenic acid (VA; trans ‐11 18:1), which was the quantitatively most important trans ‐18:1, was reduced ( P < 0.05) 3 h after diet shift in the CON treatment, but 12 h were needed to increase its level in the LO treatment, which agrees with the results of Martínez Marín et al . The sharp drop of trans ‐18:1 FAs could be related to the lack of UFAs that serve as substrates in the rumen BH processes . Thus, a sustained UFAs ingestion would be needed to maintain the BH intermediates above certain levels in milk.…”

Section: Resultsmentioning

confidence: 99%

“…to increase its level in the LO treatment, which agrees with the results of Martínez Marín et al 12 The sharp drop of trans-18:1 FAs could be related to the lack of UFAs that serve as substrates in the rumen BH processes. 20,24,25 Thus, a sustained UFAs ingestion would be needed to maintain the BH intermediates above certain levels in milk. On the other hand, the fact that rumen bacteria are able to quickly increase their BH activity, as reflected by the rise of trans-18:1 FA levels in milk fat 24 h after diet shift, 10-12 could be explained by their permanent adaptation to biohydrogenate the dietary UFAs, in order to overcome their deleterious effects.…”

Section: Monounsaturated Fatty Acidsmentioning

confidence: 99%

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Quick changes of milk fatty acids after inclusion or suppression of linseed oil in the diet of goats

et al. 2018

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Section: Resultsmentioning

confidence: 99%

Section: Monounsaturated Fatty Acidsmentioning

confidence: 99%

Quick changes of milk fatty acids after inclusion or suppression of linseed oil in the diet of goats

et al. 2018

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“…Several authors have suggested that grazing limits voluntary intake and milk production in dairy cattle (Kolver and Muller, 1998;Bargo et al, 2002;Rego et al, 2016). Therefore, it is possible that under grazing conditions there Values followed by the same letter within rows are not significantly different (P = 0.05).…”

Section: Discussionmentioning

confidence: 99%

Supplementation with corn oil and palm kernel oil to grazing cows: ruminal fermentation, milk yield, and fatty acid profile

2016

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-The effect of supplementation with corn oil (CO) and its mixture with palm kernel oil (CO:PKO 75:25) to grazing cows on ruminal fermentation, milk yield, and its fatty acid (FA) profile was evaluated. The treatments were: one control treatment (C) without oil and two treatments with 720 g d −1 /cow of CO or CO:PKO (ether extract: 22.7 g kg −1 for control treatment, 66 g kg −1 for CO, and 65 g kg −1 for CO:PKO). Six multiparous Holstein cows (6.3±1.8 yr, 597±11.5 kg body weight (BW), 160±29 d in milk; mean ± standard deviation) were assigned to a double 3 × 3 × 3 Latin square design. Cows grazed (3 kg DM/100 kg BW) a Cenchrus clandestinus (previously Pennisetum clandestinum) pasture and were supplemented with 0.9 kg d −1 DM corn silage, 4.2 kg d −1 DM concentrate, and 9 g Cr 2 O 3 . The mixture of concentrate and oils was offered twice a day. The addition of oils increased milk yield (kg d −1 ) (C: 21.4, CO: 23.6, CO:PKO: 23.9) and milk fat concentration (g kg milk −1 ) (C: 31.5, CO: 34.0, CO:PKO: 34.0). Compared with control, conjugated linoleic acid (18:2 c9 t11 CLA) proportion (g 100 g −1 FA) in milk fat was higher for oil treatments (C: 0.68, CO: 1.56, CO:PKO: 1.01). Voluntary intake and digestibility were not different among treatments. The molar ratio of acetate, propionate, and butyrate was not different among treatments, but the molar concentration of volatile fatty acids (VFA) was lower for CO and CO:PKO, resulting in a lower estimated methane (CH 4 ) production (mL/100 mol VFA) for CO and CO:PKO treatments. Supplementing CO and CO:PKO to grazing dairy cows increases milk yield without affecting voluntary intake or diet digestibility. The proportion of conjugated linoleic acid increases more for CO than for CO:PKO.

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“…El periodo de acostumbramiento fue de siete días, identificado como apropiado para evaluar el efecto de dietas de vacas en pastoreo sobre la producción, composición y concentración de AG en la grasa de la leche (Jeffery 1970;Stoobs y Sandland, 1972;Elgersma et al, 2004;Rego et al, 2016).…”

Section: Tratamientosunclassified

Intensidad de pastoreo sobre perfil lipídico en leche bovina en el trópico seco colombiano

et al. 2019

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Introducción. Se ha sugerido que el perfil lipídico en la leche bovina afecta la salud humana y se ha identificado que el ácido linoleico conjugado (ALC c9 t11) podría tener efectos anticarcinogénicos. En trópico alto se ha investigado el efecto de la alimentación sobre el perfil lipídico de la leche, pero pocos estudios se han hecho en trópico bajo. Objetivo. El objetivo fue evaluar el efecto de tres intensidades de pastoreo (1, 2 y 3 animales ha-1) en pasto Guinea cv. Tanzania (Megathyrsus maximus) sobre la producción, composición y perfil lipídico en la leche de vacas mestizas en diferentes tercios de lactancia. Materiales y métodos. De septiembre a octubre de 2013, se seleccionaron dos grupos de nueve animales (tres vacas en cada tercio de lactancia) y se asignó una vaca por tercio de lactancia a cada intensidad de pastoreo (tratamiento), durante 42 días de evaluación, en un diseño de cuadrado latino 3 x 3 replicado. Resultados. La producción de leche fue similar (p>0,05) entre tratamientos y fue mayor (p<0,05) en vacas en inicio de lactancia. Los tratamientos no afectaron (p>0,05) la composición de la leche, pero el tercio de lactancia tendió (p<0,10) a incrementar la concentración de sólidos totales y grasa. La grasa de la leche bovina en el pasto manejado con intensidad de pastoreo de 2,0 y 3,0 animales ha-1 tuvo una concentración mayor (p<0,05) de ALC c9 t11 y de ácidos grasos poliinsaturados (AGPI), que cuando el pasto fue manejado con 1,0 animal ha-1. El tercio de lactancia no afectó (p>0,05) la concentración de ALC y AGPI. Conclusión. El manejo del cultivar Tanzania con intensidades de pastoreo de 2,0 y 3,0 animales ha-1, resultó en las concentraciones más altas de ALC (c9 t11) y AGPI en la grasa de la leche, lo cual podría tener efectos positivos en salud humana.

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Changes in milk production and milk fatty acid composition of cows switched from pasture to a total mixed ration diet and back to pasture

Cited by 40 publications

References 24 publications

Quick changes of milk fatty acids after inclusion or suppression of linseed oil in the diet of goats

Quick changes of milk fatty acids after inclusion or suppression of linseed oil in the diet of goats

Supplementation with corn oil and palm kernel oil to grazing cows: ruminal fermentation, milk yield, and fatty acid profile

Intensidad de pastoreo sobre perfil lipídico en leche bovina en el trópico seco colombiano

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