Effects of Sweet and Forge Sorghum Silages Compared to Maize Silage without Additional Grain Supplement on Lactation Performance and Digestibility of Lactating Dairy Cows

This study investigated the effects of replacing maize silage (MZS) with high-sugar sorghum silage (HSS) or forage sorghum silage (FSS) without additional grain supplement in the diets of dairy cows on nutrient digestibility, milk composition, nitrogen (N) use, and rumen fermentation. Twenty-four Ch...

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Bibliographic Details
Published in:	Animals (Basel) Vol. 14; no. 11; p. 1702
Main Authors:	Zhang, Sujiang, Wang, Jiao, Lu, Shunping, Chaudhry, Abdul Shakoor, Tarla, Divine, Khanaki, Hassan, Raja, Imtiaz Hussain, Shan, Anshan
Format:	Journal Article
Language:	English
Published:	Switzerland MDPI AG 05-06-2024 MDPI
Subjects:	Agricultural production Analysis Analytical chemistry Animal lactation Animals Arid regions Carbohydrates China Corn Crops Dairy cattle Dairy farming Diet Droughts Efficiency Farm buildings Feeds Fermentation Fertilizers high sugar sorghum Holstein cows Machinery maize silage milk Milk production nitrogen use efficiency Salinity Silage Sorghum Water shortages China milk high sugar sorghum Holstein cows maize silage nitrogen use efficiency
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Summary:	This study investigated the effects of replacing maize silage (MZS) with high-sugar sorghum silage (HSS) or forage sorghum silage (FSS) without additional grain supplement in the diets of dairy cows on nutrient digestibility, milk composition, nitrogen (N) use, and rumen fermentation. Twenty-four Chinese Holstein cows (545 ± 42.8 kg; 21.41 ± 0.62 kg milk yield; 150 ± 5.6 days in milk) were randomly assigned to three dietary treatments = 8 cows/treatment). The cows were fed ad libitum total mixed rations containing (dry matter basis) either 40% MZS (MZS-based diet), 40% HSS (HSS-based diet), or 40% FSS (FSS-based diet). The study lasted for 42 days, with 14 days devoted to adaptation, 21 days to daily feed intake and milk production, and 7 days to the sampling of feed, refusals, feces, urine, and rumen fluid. Milk production was measured twice daily, and digestibility was estimated using the method of acid-insoluble ash. The data were analyzed using a one-way ANOVA in SPSS 22.0 according to a completely randomized design. Dietary treatments were used as fixed effects and cows as random effects. The results indicate that MZS and HSS had greater crude protein but less neutral detergent fiber (NDF), acid detergent fiber (ADF), acid detergent lignin (ADL), and a lower pH than FSS ( ≤ 0.04). High starch contents in MZS and water-soluble carbohydrate (WSC) contents in HSS were observed ( < 0.01). While the highest starch intake was observed for the MZS-based diet, the highest WSC intake was noted for the HSS-based diet, and the highest NDF, ADF, ADL intake was observed for the FSS-based diet ( ≤ 0.05). The diets, including MZS and HSS, had greater digestibility than that of FSS ( ≤ 0.03). Feeding MZS- and HSS-based diets increased the yield, fat, and protein content of the milk, as well as feed conversion efficiency ( ≤ 0.03). However, feeding the MZS- and HSS-based diets decreased the contents of milk urea N, urinary urea N, and urinary N excretion more than the FSS-based diet ( ≤ 0.05). The N use efficiency tended to increase relative to diets containing MZS and HSS compared with FSS ( = 0.06 and = 0.09). Ruminal ammonia-N and pH were lower, but total volatile fatty acids, acetate, and propionate were higher in cows fed the HSS- and MZS-based diets compared to those fed the FSS-based diet ( ≤ 0.03). It appears as though replacing MZS with HSS in the diet of cows without additional grain supplements has no negative influence on feed intake, milk yield, N utilization, or ruminal fermentation.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	2076-2615 2076-2615
DOI:	10.3390/ani14111702